iOS 5 is now tethered jailbroken on all devices except the iPad 2 and iPhone 4S. There’s no untethered jailbreak on iOS 5 and don’t believe
Even though Winterboard for iOS 5 has been released, only some themes are currently compatible with iOS 5, and others are not.
By navigating to Cydia, you can get Winterboard (and let it to reload) then search for “Winterboard” and you’ll see version 0.9.3211-1. The unreleased version was 0.9.3901.
Download Winterboard for iOS 5 (winterboard_0.9.3900-1_iphoneos-arm.deb)