Microsoft is running its 3rd annual Winter Scripting Games. Three languages are allowed: VBScript, PowerShell, and Perl. The event sounds interesting. Check it out at:
http://www.microsoft.com/technet/scriptcenter/funzone/games/default.mspx
I didn't know about this event until somebody emailed me this morning. You bet I'll be looking into it, if not for anything else but to find whether there are compelling reasons for PowerShell :-)