If you were intrigued by our previous post on PowerShell, but found it difficult to get started using notepad or your favorite text editor, try this:  PowerShellIDE.
In addition to having useful editor features (like IntelliSense and collapsing code blocks) it also uses the groovy new Office 2007 look and feel.  Free download, for now.

If you're interested in getting a good overview of PowerShell, here's a free e-book.