hmm, don't think apple would be too stoked on this... kinda shady. really need the $8, eh?
on another note, the beta is really quite stable from what I've noticed (much more than the iOS4 beta that almost drove me insane). Notifications are rad and a very welcomed changed. The only real bug I've encountered is with text messages as they tend to send and receive multiples (sent an unhappy one to my sales advisor, and afraid it was sent 5 times and they think i'm irate
Also, once you upgrade, you cannot downgrade back to os4.