Moo! The Musings of a Plaid Cow

I use Rename Files to keep files renamed and Organize Files to keep everything the way I want it to be. Mac only, they are available right from iTunes and do the job quick.

They allow you to rename and organize files based on any of the ID3 tag data items, including some basic if-then logic and limited reformatting. (Yes, I might be a bit biased since I am the author of both of these tools.)

Response to the LifeHacker post on Keep iTunes 8 from Starting Filenames with Track Numbers.