I'm interested in doing a fresh install, but it removes everything from my computer? I've only had it since the end of June, but it already needs some cleaning. I just don't want to lose all of the applications I've paid for. That'd be a real bummer. No safety for those?
You would have to reinstall all those files. So you have:
1) Find your installation disks to reinstall programs. (i.e. iLife, Adobe Creative Suite, Final Cut Studio, Microsoft Office 2004, Parallels or VMFusion, etc.)
2) Keep a record of serials for downloadable programs. I got a free version of DivX and it came with a serial, I have that serial saved so that when I download the program again, I'll be able to register it.
3) Download and install. (i.e. VLC, Adium, QuickSilver, GoogleEarth, etc.)
It just depends, I've had my MBP for a year almost, it's time to fresh install, I want Leopard to run as fast as possible. I really want to see what a difference there is with 64-bit, better multi-core support, etc.