I recently returned my MBP 2.2 that had a custom 7200rpm HD drive in it (waiting for the Penryn). Doing my usual audio stuff in Logic and Mainstage, even with a LOT of samples/software instruments playing, the HD meter never really registered. It only registered when I was playing back one of the demo songs that had a lot of AUDIO tracks on them. So, is it safe to say that if I'm mainly just using software instruments (which I am/was), that the HD speed isn't all that important? If so, I may get a larger capacity 5400rpm HD in my next MacBook Pro. And, what about standard OS use (Finder, playing high definition movies, Safari, Final Cut Express/iMovie etc.), is there any noticeable speed difference between the 2 drives in normal situations? What does anyone think? Thanks.