That's about right. The new iLife apps take up a lot of space in your Library folders...iDVD themes, GarageBand loops, etc.
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.
6 gb = formatting