I just got a new mac laptop couple days back , my first time using a mac machine. It came with OSX Tiger.
I have been playing around with it for few days but dunno what keeps resetting my settings in the OS, i.e my account settings in iChat, iMail ( including my emails!!) , my songs in iTunes and apps I install.. I keep losing them!!
Since this problem is across the board, just like Alexis above I am wondering how you actually quit your applications. Do you do a Command (or Apple key) + Q before leaving your applications?