I have a 4GB iPhone I updated to v2.0 late Friday. Yesterday, all my Apps were running fine. Today, I try to run Big Bang Sudoku and it crashes. Subsequent attempts also fail, so I turn off the iPhone and restart it. First restart, phone doesn't boot properly and only allows me to make emergency calls, so I reboot again. Second restart appears to load fine. I enter passcode and, strangely, phone tells me my account has been activated (got that message after I upgraded to 2.0 on Friday). Everything else seems normal except every single downloaded app crashes...even simple little things like Flashlight.