Check out Synchronize,
http://www.qdea.com/pages/pages-syncx/syncx1.html
They have a demo version.
Apples Disk Utility does a great job of cloning discs but you sound like you want to start from scratch.
Moses suggestion is not bad at all.
Buy a new drive and use the old one as back up storage.
If you go the new drive route then I HIGHLY recommend the 60 gig Hitachi.
My 17 in. came with the 80 gig 5400 RPM drive, I swapped it for the smaller 60 gig Hitachi 7200 rpm drive.
Model: HTS726060M9AT00
The drive screams. It makes all the difference in the world.
Scott