Ultimate link list for all things PowerShell. Start here when you need to find something on PowerShell.

Home of the Scripting Guy. Tons of useful scripts and articles on PowerShell.

For pre-Windows 7 and pre-Server 2008 R2.

Use these virtual labs to learn and experiment with new PowerShell features like remoting, Active Directory module, AD recycle bin, etc.

Huge repository of community-written scripts.

Another treasure trove of already-written PowerShell scripts for common needs.

From the father of PowerShell himself. Read this to understand the background and intent of PowerShell.

Handy quick reference for popular script syntax.

See what people are doing with PowerShell. Try it out.

The Active Directory Management Gateway Service enables administrators to manage Active Directory Domain Services and Active Directory Lightweight Directory Services (AD LDS) or Active Directory Application Mode (ADAM) using Active Directory module for Windows PowerShell and the Active Directory Administrative Center.

Work with members of the Windows PowerShell team and the community to identify, collaborate, and evaluate the importance of issues. Help us ensure that the product exceeds your expectations.

Tons of great community videos

This is my favorite. You can start all the way back at episode 0 and use it as a PowerShell tutorial during your commute. The more recent episode have great topical conversations and interviews.

Podcasts straight from the source.

Legendary blog of PowerShell MVP, Brandon Shell

Tons of practical PowerShell examples from the Microsoft Scripting Guy.

Official Microsoft PowerShell team blog.

Get AD scripts straight from the source.

Leader of the Central Ohio PowerShell Users Group