I've never had a Mac of my own to configure as I see fit (24" iMac on the way!), but I have had some experience with Unix/Linux machines in the past, so I'm wondering... When you uninstall OS X software, is the uninstall completely clean, like my experience has been with other Unix boxes, or do you still need to be careful about what you install like Windows? With XP, I'm constantly reloading my computer due to botched, incomplete uninstalls, corrupted registry, etc. Will I ever have to worry about this sort of thing again?