Today was the release of a new update for the iOS 5 SemiTether Jailbreak. As some may know, this a is a Cydia package that you can download after Tether Jailbreaking an iOS 5 device that will allow you to boot up without a computer. If you happen to ever run out of battery or power off your and you're not near a computer, you're in luck. After installing the newest version of SemiTether, you will be able to power off your tethered device and still have the ability to turn it back on. Turning it back on will cause all of your Cydia tweaks and downloads not to work, but everything native to the device along with 3rd party apps will work. Mail is still a bit buggy but at least we now have Safari fully running after a SemiTethered boot. To revive all of your tweaks and packages, you just simple boot tethered from a computer as you normally would and you are back in the game.
You can download SemiTether from the Big Boss Repo in Cydia for Free. The iOS 5 unthethered Jailbreak should be releasing sometime within the next few weeks. Stay Tuned.