-- William Gibson, All Tomorrow's Parties
So I have to say that out of all the features hyped in Leopard, Time Machine seems to be worthy of it. It really does make backups trivial.
I had a bunch of tarballs in ~/Desktop which were basically transient. I didn't want them backed up, but backed up they got, eating a couple gigs of space pointlessly. My initial reaction was to just rm them from the backup dirs, but I was told (as root) I could not. I don't really like being told I can't do things when I'm root, but ok, maybe there's other magic required. Maybe it's not as flat-filesystem-y as one is led to believe.
A quick Googling later, and the answer was thankfully trivial. The Time Machine UI is ... totally weird enough ... that I've been avoiding it. But nice to see it's so easy to do something so obvious.