Thanks to The Jenson, I'm now running OS X 10.2.3 with journaling on my PowerBook. Ah, glorious new software. One weird thing I've noticed thus far is that when I switch tracks on CDs, iTunes spins the disc down and then spins it back up again, with obvious dead air, lag time, and the sound of the drive oscillating. One potentially useful tip: if you're using a laptop, tweak the font smoothing to the "Medium - best for Flat Panel" setting in General in System Preferences. Made things less fuzzy yet noticeably better than no font smoothing (if you like font smoothing) on my laptop display.