the crash on exit was a 10.6.6 issue while gaming. The only crashes i have had since 10.6.7 are with Itunes and Chrome.
You can argue all you like, but if you're having crashes, there's something wrong. Especially if you're having crashes in iTunes, which is rock-solid here. You pooh-poohed my suggestions for troubleshooting your problems, but if you simply look for someone else to solve your problem for you, you'll be disappointed.
BTW, since it now sounds like you're also having some potential hardware issues, I would add running [Apple Hardware Test|http://support.apple.com/kb/HT1509] and [resetting the SMC|http://support.apple.com/kb/HT3964] to the list.