PDF display is broken in both Safari and Firefox. Most of my files have lost their proper application bindings. And my external SATA drives aren't working (apparently a known problem. So I can't connect to my Time Machine drive. So I can't even revert my Snow Leopard install.
What the fuck, Apple?
[UPDATE] The PDF display problem turned out to be an incompatible plugin (the Schubert PDF plugin). But the ESata problem seems to be real, and the only solution is to either buy a new ESata adapter or wait for Silicon Image to update their drivers. I'm not optimistic. It's not as if they didn't know Snow Leopard was coming. :-(