Encountered a weird problem today.
I installed the Camera RAW update and restarted my computer. When I went to start iTunes, it bounces twice in the Dock and then nothing. The indicator under iTunes is highlighted but iTunes is "Not Responding". Force Quit doesn't work and iTunes does not show up in Activity Monitor as a running process.
Restarted (only way to get iTunes to quit), trashed iTunes and all iTunes preferences, and removed my iTunes Library file from the iTunes folder. Downloaded iTunes 8.01 from Apple, installed, and tried to start it up. Same thing happens as described above.
Anyone know anything else I can try? Logging into Guest account encounters the same problem with iTunes. Haven't tried making a new user yet. Off to try that now...