Freeing up space

Well, it's not quite Spring yet, but I'm doing a little virtual cleaning. The 100GB hard drive on my 15-inch Powerbook only has a little over 1GB free, so I'm going through and cleaning house. There are, of course, the multitude of videos in iTunes. It still aggravates me that you cannot burn backup copies of the iTMS-purchased videos via iTunes, but instead have to locate them inside your Music folder and manually drag them over to a disk to be copied. There's also a couple of gigs of email. Since I kicked Mail.app to the curb a little over a month ago and decided to give Thunderbird a whirl, I decided, why bother with an email client at all. I just migrated all my email over to Gmail and am archiving all my local mail folders. Next is to go through and remove all the extra programs that I never use. Then... what? Language localizations?

Share your space-saving tips in the comments.