pshvm.codeplex.com my master piece a free powershell hyper-v manager project.
Hyper-V: Tools from Microsoft Technet
Hyper-V: Scripts from Microsoft Technet
I have found some of the links very useful and some of them not so much.
CODEPLEX CodePlex is Microsoft's free open source project hosting site.
Hyper-V Servers Best Practices and checklist This is worth the read
Hyper-V Forum -Official Microsoft Technet Site