A quick note for jailbreakers out there, TinyUmbrella has been updated to bring support for the iOS 5 beta 1. TinyUmbrella's developer, Notcom, also added a new, nifty alert to remind users to "Request SHSH from Cydia" and "Set Hosts to Cydia on Exit" as soon as possible.
Make sure you don't use TinyUmbrella to update to iOS 5 while preserving your baseband as the "fixrecovery" feature hasn't been updated yet...