News - First iPhone 4 jailbreak released

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Hackers unleash browser-based jailbreak for Apple’s new handset but problems have been reported.

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Read more.

This also jailbreaks 3G and 3GS on iOS 4, not just iPhone 4

Just jailbroke my 3GS and now have access to SBsettings again !

http://jailbreakme.com is a bit overloaded, there's a mirror at http://jailbreakme.modmyi.com
(just open either site on safari on iPhone to jailbreak)