The day I got my 15" MacBook Pro it was obvious the hard drive is what was limiting the performance. I have done a lot of experimenting with RAM disks since I have it maxed out at 4GB.

For example, intense BitTorrent downloading (and uploading) on a RAM disk frees my hard disk from the constant reads and writes so I can have high speed downloads (and verification of d/led data) and still do disk intensive activities in other applications.

I can't wait for the day where my mass storage can have that kind of speed! (and it looks like it's closer than ever now)