FaceBreak is a tweak which enables FaceTime calls over 3G and has been updated to enable support for iOS 5 & 5.0.1. The update also fixes serious memory loss, which some devices experienced.
“Enable FaceTime over 3G ! With 1 click and no setup, you can get FaceTime running over 3G and use it anywhere you want. No more looking up for nearby WiFi connection to use FaceTime. – Just install and Respring. FaceTime will now also work when on 3G! “
FaceBreak is available from Cydia for $1.99. (Screenshot’s below)