The Flight Tracker dashboard widget that comes with Mac OS X 10.4 (Tiger) seems to have a fairly major bug. However, this bug seems to be the result of something quite obscure to do with timezones, and it only seems to manifest itself in the UK during the summer.
I've been trying to track down a few annoying apps that start up on my iBook and can't be found in any of the usual places. I checked the normal places: the Login Items for my user, LaunchAgents and LaunchDaemons, and a few other places... I forgot to check loginwindow.plist.