Powershell is a truly awesome new shell that we've recently shipped with .NET 3.0 and Windows Vista. What is it? It's basically the "Have it your way" of shells, think batch files on hyper-steroids. My buddy Rob has been doing some great posts about what you can do with it. A few of them are listed below. I strongly advise checking them out.
http://msmvps.com/blogs/robfarley/archive/2007/01/03/cricket-powergadget.aspx - Building a Cricket gadget using powershell
http://msmvps.com/blogs/robfarley/archive/2007/01/05/powershell-and-sql.aspx - Iterating SQL Server databases.
01/05/2007 - This just in, check out this newly created blog as well....http://mybsinfo.blogspot.com/2007/01/beginning-and-end-process-to.html