Apple has released a new version of iTunes, iTunes 9.1 which changes how certain things work. If you have upgraded to iTunes 9.1, several programs including Blackra1n will start giving you an error that ASL.dll is missing.

George Hotz will be releasing Blacksn0w and Blackra1n RC3 on November 3rd instead of November 4th. For those who are unaware what this is, here is a bit of head up. Blacksn0w is the unlock tool for the latest 05.11.07 baseband. It will   enable official tethering on your iPhone. Blackra1n is   a jailbreak [...]

George Hotz posted a picture of the working version of Blackra1n. The teaser shows Blacksn0w installed on the phone, which will allow users to unlock iPhone 3G/3GS with OS 3.1.2 on baseband 05.11.07.

Video tutorial that explains how to jailbreak/unlock iPhone OS Firmware 3.1 and Firmware 3.1.2 using Blackra1n. The instructions allow you to jailbreak you iPhone 3G/3GS and install third party applications that are not available in the app store.