This is so strange.... several times, when I quit iTunes after having installed SL, it will just relaunch itself right away. The only way to get rid of iTunes is to restart the machine - even log out won't work, it just tells me that iTunes cancelled the logout. I notice that iTunes is also using a lot of CPU while exhibiting this behaviour, around 25-30% in iStat. Pretty annoying. I like iTunes but I want to be able to decide for myself when I want it running, thank you I am on a MacBook Pro btw. EDIT: Force-quitting from Activity Monitor kills it off - but regular Force Quit doesn't.