QuickPwn updates its wares to support the new OS just a day after Apple releases it. It's said that this should work with all iPhone/iPod touch devices. After you go thru the jailbreak process, you will need to open icy and follow some steps to complete. The crack is for Windows as of right now.

via: Jailbreak iPhone 3.0

See More: iPhone OS 3.0 beta 2...jailbreak treatment