Greenpois0n, which uses the Limera1n jailbreak for iOS 4.1 is now out for Mac. As always, approach at your own risk. The process is pretty well refined by now, but make sure to do some research about what works and what doesn’t with this version, and if you screw something up, it’s your own damned fault.
The exploit should work with the iPhone 4, iPhone 3GS, iPod Touch 3G and 4G, and the iPad. Theoretically, it works on the new Apple TV, but you can’t do anything with the new device.
[via Redmond Pie]