Another tip:

I've started manually gathering files together after I complete a specific project and them burning them to CD (double checking everything of course). I always include a "support" folder that includes things like layered Photoshop files and Illustrator files. You might consider doing that on a "per project" basis and also creating a "master" support folder that includes your master templates - things you'll use repeatedly. That way you can clean off things that are done but you always know where the stuff is to start the next project is.

No sense taking up valuable HD space with archives of stuff you won't use again for months.

Before they made me they broke the mold!
http://home.roadrunner.com/~kflach/