If you want to get out while the getting is good, you can come back from the dark side and for most, it is a lot easier than you might think. If the version of jailbreak software you have installed offers a "Safe Mode" which most do, all you will have to do is put your phone in this mode to sync. Once your iPhone has been backed up, you have transfered your purchases to iTunes and then downloaded the newest version of iOS you are ready to go. Be prepared for a few hours of sync time, because these backups do take some time.
