My chain seems to be totally unaffected, but the wheel is completely out of whack -- from looking at it I think maybe the wheel came out of whack first and as a result the chain flew off. It's possible I bent something or something gave out but I'll have to wait until tomorrow to get a closer look at it -- funny thing, too -- I'm just waiting for the local shop to finish up my Soma Rush build so hopefully they'll be done sooner than later.