The iPhone Dev-Team has posted simple instructions on how to unlock/jailbreak iPhone after Friday’s 3.0.1 update:
“You can re-use redsn0w v0.8 we released a few weeks ago to jailbreak today’s 3.0.1 update. Just let iTunes update or restore you to official 3.0.1 then run redsn0w. The only trick is that when redsn0w asks you to identify the IPSW used, point it at the 3.0 IPSW instead of the 3.0.1 one. After the jailbreak, reinstall ultrasn0w 0.9 if you need the unlock.”
The team goes on to state that it will update redsn0w to recognize iPhone 3.0.1 at some point, but it stresses that 3.0 and 3.0.1 are identical, save for the SMS fix.