GreenPois0n has released candidate 6 and it includes support for the second generation Apple TV. With this new Greenpois0n RC6 you will be able to install NitoTV App that lets you play more video formats. The Greenpois0n RC6 is available for both for Mac and Windows.
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Supported iDevices:
- iPod Touch 2G (all bootroms)
- iPod Touch 3G
- iPod Touch 4G
- iPad 1G
- iPhone 3Gs (all bootroms)
- iPhone 4
- iPhone 4 Verizon
- Apple TV 2
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I think GreenPois0n RC6 is to jailbreak Apple TV G with iOS 4.2.1