me and my now-locked updated 3.1 iphone can help you with this(for sale by the way...)
once you update to the 3.1 software, your done trying to jailbreak it...the 3.1 update removes all of the loopholes that were used to jailbreak/unlock the iphone, it also updates the bootloader(the part that controls everything)-- so you can't go back to 3.0, or jailbreak it, possibly never again... and for those that are thinking of updating their jailbroken iphone:
USE ONLY A CRACKED 3.1 UPDATE!!!! DO NOT USE THE 3.1 UPDATE FROM APPLE!!!!
sorry, i'm still ****ed at crApple for doing this...(it was a micro$oft style update)