Apple and the jailbreaking community continues with another exploit which has been discovered within the A4 chip bootrom, by p0sixninja, that jailbreak the iPhone 4, iPod touch 4 and iPad. GeoHot released the new jailbreak ahead of Greenpois0n, which's still slated for 10/10/10.
The jailbreak called "Limera1n" works on the iPhone 3GS, iPod Touch 3G, iPad, iPhone 4, iPod Touch 4G on iOS 4.0, 4.01 and beyond. Oh, and it's only for Windows at this time -- Mac and Linux coming soon. If you really want to jailbreak you may want to wait for Chronic's Green Poison.
"GeoHot, aka George Hotz, is famous for his widely used BlackRa1n, which could jailbreak any Apple device at the time. Hotz was also the first hacker to successfully unlock the first iPhone, allowing it to work on any GSM carrier in the world."
You can download Limera1n here.