FYI - Apple is still signing iOS 5.0.1 firmware, so if you did "accidentally" upgrade to iOS 5.1 and obviously lost your jailbreak, if you act quickly, you can still downgrade to iOS 5.0.1.
There is an updated Redsn0w out for an iOS 5.1 firmware jailbreak, but it's only for A4 processors, and it's semi-tethered.
There is an updated Redsn0w out for an iOS 5.1 firmware jailbreak, but it's only for A4 processors, and it's semi-tethered.