If you’re in need for iPhone 4 jailbreak after upgrading to the latest iOS 4.1, there’s good news for you. A new jailbreak called limera1n from Geohot has just being released ahead of iPhone Dev Team. This release however is reported to be slightly buggy as listed on their site.
Some known bugs are 3GS new bootrom is broken and Cydia icon will only be displayed when restarted after installing. From what we have seen with others, this is far from perfect so jailbreak at your own risk. Currently it is only offered for Windows, so linux and mac folks gotta wait for another update.
If you understand the risks involved and be the first to have cydia on iOS 4.1, head on to limera1n.com.