Jonathan, here's how to "go back." Download the older version here:
http://www.apple.com/downloads/macosx/apple/ipod_itunes/itunes821forg3.html
A) Before you attempt to install it, however, you have to
1) Throw the iTunes 9 application in the trash (no need to delete).
2) Move the "iTunes Library" file into the "Previous iTunes Library" folder, and
3) Replace it with the *2nd most recent* "iTunes Library" file from the "Previous iTunes Library" folder. Literally, drag it out into the main folder and rename it "iTunes Library" (For example, mine was named "iTunes Library 2009-06-15" Be sure not to pull the one with the most recent date on it.)
B) Install iTunes 8.2.1. Breathe easy (I hope. It worked for me after a bit of fussing. I don't think there's anything missing, but I can't guarantee it. That's why I recommend not trashing anything until you complete the process). You should be back in business until there's a patch for 9.
Man, it's awful...