In Panther, the iCal icon would display 17 June in the dock until you opened the app, at which point it would switch to today's date. After closing the app, it would retain today's date in the dock, but not (as far as I know) change the date at midnight. In Tiger, after closing the app the icon would revert back to the default 17 June date.
The randomly shifting audio-bug; I've had that problem too where for no apparant reason, the audio balance in System Preferences would shift slightly to my right-hand speaker always; interestingly never to the left. I probably never noticed it for a while.