Unsurprisingly, the first XBOX 360 issues have been spreading on the internet. Here's a major one: apparently the power supply (or 'power brick' as it has been dubbed due to its massive size) has a tendency to overheat and cause glitches and crashes. Interesting....
http://www.gamespot.com/forums/show_msgs.php?topic_id=23998153&page=0
http://www.gamespot.com/forums/show_msgs.php?topic_id=23998153&page=0