Top Level Site for PowerShell: http://www.microsoft.com/powershell
These audios and videos offer Windows PowerShell tips, news and interviews that you can listen to at your convenience.
Windows PowerShell Webcasts has a list of 70+ different PowerShell presentation in multiple formats.
To see the entire list select "MORE" on the right-hand side opposite the heading that reads "IT Professionals")
This is a sampling of some of the blogs that are being written on the subject of Windows PowerShell. Some of these are independent blogs and their contents are not reviewed or controlled by Microsoft.
This section represents links to actual PowerShell scripts that have been developed for review and reuse. These scripts are intended to keep administrators from having to "start from scratch" when developing scripts. While they will almost certainly require some modification, the intent is to give admins a starting point to learn how to do various tasks related to PowerShell in their own environments.
The Microsoft forums are places where administrators can ask questions, read discussions among technical professionals, and engage with the online community. The following forum is dedicated to PowerShell.
The following is a partial list of books that have proven useful as PowerShell resources, both to the new admin and the experienced developer. This is not intended as a complete list of PowerShell books, but is intended only as a sample for the admin seeking to start building his or her own library.
In this section are a variety of external resrouces offered to the PowerShell community in the form of blogs, sample scripts, wikis, forums, etc.
These resources are specifically designed to help prepare for the newest version of PowerShell to be released in the near future.