Server 2003 R2 - Server 2008 File Screening
One of the most underused and most powerful (and awesome) features of the R2 release of Server 2003 and standard in 2008, is file screening.....This is a really really cool feature that gives you complete control of what is stored on your server - the control is unbeleivable, you can block on file types, size, user, etc
A great run through as usual from the guys on the windowsnetworking site is worth a read
http://www.windowsnetworking.com/articles_tutorials/Implementing-File-Screening-Windows-Server-2003-R2.html
Have a try of this on your own servers, i guarrantee you will find a use for it, and tie it in with storage quotas etc, and your control over your file servers takes a step in a whole new direction
James