I've a piece of Freeware that I have used for several years, 100% without a hitch, and cannot recommend it highly enough. In that time it has seen many changes and updates, (most recently 28th July) and I've had excellent response to any questions that I've asked of the author ... even more astounding when you consider that this software is available for free
It can be either as simple to use as you wish (and is virtually idiot-proof!), or is capable of performing some very complex re-naming tasks ... I've yet to come across a re-naming scenario that it could not handle.
Only possible drawback is that although I can vouch for the Windows version (with 98 and XP) I have no experience with it on Vista (yet), though according to the site it works (and from experience, I'm inclined to believe them!) .. and I don't think there is a Mac version available.
Called, simply, Bulk Rename Utility, it's available here:
Bulk Rename Utility
Personally, I wouldn't be without it!
