Been using the xbox formatted flash disk since the update came out (Note to someone who posted that they watched some tv series using this - you've always been able to watch videos from a flash disk and this thread is about the update that allows you to save xbox content to a flash disk)

Anyway, works perfectly, got the warning that it might be a little slow. I'm using an oldish flash disk of mine (4 gigs), and admittedly it takes longer to save games, but don't really mind waiting a little longer for the convenience of being able to easily play different xboxs.