Every so often there’s a folder of files that need to be renamed, awhile back I found a handy bit of software called Name Changer, which does just that.
Check it out here: http://www.mrrsoftware.com/MRRSoftware/NameChanger.html
The software is Mac only
Designed for OS X 10.6+, NameChanger is a Universal Binary, so it runs on both Intel and PowerPC.
and best of all it’s free, but donations are accepted via paypal.