The big memory hogs are GarageBand, iWeb, and iDVD. If you never plan on using those, just delete them.
Honestly, 62GB is pretty good. I have most of the big apps still around, plus all the Apple developer tools, and I'm at around 58 or 59 GB. I fully expect that that upgrade to Leopard and iLife '07 is going to eat up at least 5GB more, too.