[Jeremy]

Originally Posted by chilihost

the best tool I have found is free and is called renamer: http://www.1-4a.com/rename/

cheers,
Luke

I tried that, but couldn't get on with it :-((

I've found this to be the most powerful renamer out there:

The Rename

(Unzip Them All also looks like a really handy utility).

If anyone knows of one that can be called and run from the command line, then I'm all ears! :-)