I have been working more and more with PowerShell lately and I love it. If you want to watch a great introductory 75 minute video to get up to speed quickly, look no further than here:
Windows PowerShell Crash Course
It is presented by Don Jones and Jeffrey Snover. They share a number of great tricks and tips, too. I may start posting daily tricks and tips either from the video or that I learn as I experiment with PowerShell. Hopefully they won't mind me re-posting their tips.