Virtualization TechCenter: http://technet.microsoft.com/en-us/virtualization/default.aspx
Hyper-V Planning and Deployment Guide: http://download.microsoft.com/download/8/1/5/81556693-1f05-494a-8d45-cdeeb6d735e0/HyperV_Deploy.doc
Hyper-V Forum: http://forums.technet.microsoft.com/winserverhyperv/threads/
Virtualization Solution Accelerators: http://technet.microsoft.com/en-us/solutionaccelerators/cc197910.aspx
Windows Server 2008 Virtualization & Consolidation: http://www.microsoft.com/windowsserver2008/en/us/virtualization-consolidation.aspx
Hyper-V FAQ: http://www.microsoft.com/windowsserver2008/en/us/hyperv-faq.aspx
Windows Server 2008 Hyper-V Performance Tuning Guide: http://www.microsoft.com/whdc/system/sysperf/Perf_tun_srv.mspx
MSDN & TechNet Powered by Hyper-V: http://blogs.technet.com/virtualization/archive/2008/05/20/msdn-and-technet-powered-by-hyper-v.aspx
MSDN & TechNet Powered by Hyper-V Wastepaper: http://download.microsoft.com/download/6/C/5/6C559B56-8556-4097-8C81-2D4E762CD48E/MSCOM_Virtualizes_MSDN_TechNet_on_Hyper-V.docx
Optimized Desktop Infrastructure (VDI and much more): http://www.microsoft.com/windows/products/windowsvista/enterprise/default.mspx
Microsoft Virtualization Home Page: http://www.microsoft.com/virtualization/default.mspx
Virtualization Case Studies: http://www.microsoft.com/virtualization/case-studies.mspx
Microsoft IT Insight Workshop on Virtualization. http://technet.microsoft.com/en-us/library/bb687787.aspx#virt
Microsoft Integrated Virtualization ROI Tool: https://roianalyst.alinean.com/microsoft/virtualization/
Microsoft Assessment and Planning Toolkit Solution Accelerator: http://technet.microsoft.com/en-us/library/bb977556.aspx

Articles:
Virtualization: An Introduction to Hyper-V in Windows Server 2008: http://technet.microsoft.com/en-us/magazine/cc895595.aspx
The introduction of Hyper-V makes virtualization an even more compelling solution for IT environments. Get an overview of today’s virtualization market and see how Hyper-V improves the manageability, reliability, and security of virtualization by Rajiv Arunkundram
Virtualization: Manage Your Virtual Environments with VMM 2008: http://technet.microsoft.com/en-us/magazine/cc836456.aspx
System Center Virtual Machine Manager provides a consolidated interface for managing your virtual infrastructure. The latest version adds support for Windows Server 2008 Hyper-V, as well as for VMware virtual machines. Explore the new features and get an overview of using VMM to centralize your management tasks by Edwin Yuen
Virtualization: Getting Started with Microsoft Application Virtualization: http://technet.microsoft.com/en-us/magazine/cc904189.aspx
Microsoft Application Virtualization (App-V) allows you to deliver virtualized desktops to client systems throughout your organization. This simplifies system management and liberates employees from their desktops. Take a close look at how App-V works and discover how you can deploy it in your organization by Anthony Kinney
Virtualization: Achieving High Availability for Hyper-V : http://technet.microsoft.com/en-us/magazine/cc837977.aspx
Consolidating servers onto fewer physical machines has many advantages, but it is extremely important that you plan for your systems to be highly available. Here’s a guide to using Windows Server 2008 Failover Clustering to bring high availability to your Hyper-V virtual machines by Steven Ekren
Virtualization: Backup and Disaster Recovery for Server Virtualization : http://technet.microsoft.com/en-us/magazine/cc895627.aspx
Virtualization brings significant changes to disaster recovery. Here’s an introduction to how the Microsoft virtualization platform factors into your disaster recovery plan, as well as a deeper look into backup and restore options and considerations for Windows Server 2008 Hyper-V by Adam Fazio
Virtualization: Essential Tools for Planning Your Virtual Infrastructure : http://technet.microsoft.com/en-us/magazine/cc895647.aspx
Is your infrastructure ready for virtualization? The Microsoft Assessment and Planning Toolkit, a network-wide infrastructure assessment tool, can help you better understand your IT infrastructure and determine whether your systems are ready for upgrade or migration to a variety of technologies, including virtualization by Jay Sauls and Baldwin Ng

Blogs:
http://blogs.technet.com/virtualization/default.aspx
http://blogs.msdn.com/virtual_pc_guy/
http://blogs.technet.com/jhoward/
http://blogs.technet.com/roblarson/
http://blogs.technet.com/virtualworld/
http://blogs.technet.com/windowsserver/
http://blogs.technet.com/mapblog/
http://blogs.technet.com/stbnewsbytes/

http://blogs.technet.com/josebda/default.aspx

Feeds:
Virtualization feed: http://virtualizationfeed.com/
Every mention of Hyper-V on TechNet blogs: http://blogs.technet.com/search/Searchrss.aspx?q=Hyper-V&o=Relevance#
RSS feed of Virtualization Support Issues: http://services.community.microsoft.com/feeds/feed/VirtualizationSupportFeed#
A feed of everything that gets posted on community content in the Hyper-V library: http://technet.microsoft.com/en-us/library/community-edits.rss?topic=cc753637|en-us|10

Webcasts and videos:
Virtual Machine Manager 2008: http://edge.technet.com/Media/Virtualization-Launch/
Microsoft Hyper-V Server 2008 :http://edge.technet.com/Media/First-Look-Hyper-V-Server/
Microsoft Windows Server 2008 R2 Live Migration : http://edge.technet.com/Media/Demo-Hyper-V-Server-and-Live-Migration/
http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?culture=en-US&EventID=1032368894
http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?culture=en-US&EventID=1032372420
http://edge.technet.com/Media/Interview-with-Windows-Server-2008-Virtualization-program-managers/
http://edge.technet.com/Media/How-MSIT-does-server-Virtualization-and-Hyper-V-Part-2/
http://edge.technet.com/Media/Hyper-V-Part-3-TAP-and-VSS-Snapshots-Interview-with-PMs/
http://edge.technet.com/Media/Hyper-V-how-it-works-Interview-with-PMs-Part-4/
http://edge.technet.com/Media/Hyper-V-Part-5-High-Availability-Interview-with-PMs/
http://edge.technet.com/Media/Windows-Server-2008-Virtualization-PM-Bryon-Surace-in-the-Fish-Bowl/
http://edge.technet.com/Media/Jeff-Woolsey-on-Hyper-V-RC/
http://edge.technet.com/Media/SQL-2008-Virtualization-and-Consolidation-with-Charley-Hanania/
http://edge.technet.com/Media/Using-Powershell-to-managed-Hyper-V/

Podcasts:

Virtualization Security Best Practices: http://download.microsoft.com/download/5/c/b/5cb1943c-751d-4fd4-a897-38926e90a86f/BrandonBakerHyperVSecurity2Podcast.wma
How Microsoft IT Uses Virtualization:
http://download.microsoft.com/download/0/c/5/0c5d7ca4-35d2-45ae-ac47-f83b6d774fa0/DavidLefPodcast.wma
http://edge.technet.com/Media/TechNet-Radio-Hyper-V/
GetVirtualNow Announcements: http://download.microsoft.com/download/3/8/0/38001862-0367-4986-b94b-032af340e7b1/MikeNeilPodcastGetVirtualNow.wma

There is a new blog and Twitter aggregator (independent bloggers and 14 Microsoft bloggers on either TechNet or MSDN) for virtualization: VirtualizationFeed at http://www.virtualizationfeed.com/.

www.codeplex.com/psHyperV

Including:

Finding a VM
Get-VM, Choose-VM , Get-VMHost

Connecting to a VM
New-VMConnectSession

Discovering and manipulating Machine states
Get-VMState , Set-VMState , Convert-VmState,
Ping-VM , Shutdown-VM , Start-VM, Stop-VM, Suspend-VM
Get-VMKVP, Get-VMJPEG

Backing up, exporting and snapshotting VMs
Export-VM , Get-VMSnapshot, Choose-VMSnapshot , Apply-VMSnapshot , New-VMSnapshot ,Remove-VMSnapshot, Get-VMSnapshotTree, Get-VmBackupScript

Adding and removing VMs, configuring motherboard settings.
New-VM , Remove-VM , Set-VM , Get-VMCPUCount, Set-VMCPUCount, Get-VMMemory, Set-VMMemory

Manipulating Disk controllers, drives and disk images
Get-VMDiskController
Add-VMSCSIController , Remove-VMSCSIcontroller
Get-VMDriveByController , Add-VMDRIVE , Remove-VMdrive
Get-VMDiskByDrive, Add-VMDISK , Set-VMDisk, Get-VMDisk
Get-VMFloppyDisk , Add-VMFloppyDisk
Add-VMNewHardDisk

Manipluating Network Interface Cards
Get-VMNic , List-VMNic , Choose-VMNIC, Add-VMNIC, Remove-VMNIC , Set-VMNICAddress , Set-VMNICConnection , Get-VMNicport ,
Get-VMnicSwitch, Choose-VMSwitch, New-VMSwitchPort, Get-VMByMACaddress, Choose-VMExternalEthernet,
New-VMExternalSwitch, New-VMInternalSwitch,New-VmPrivateSwitch

Working with VHD files
Get-VHDDefaultPath, Get-VHDInfo, New-VHD, Compact-VHD, Test-VHD,Convert-VHD,Merge-VHD,Mount-VHD, Unmount-VHD