Redsn0w has been updated for Windows and Mac
It is available for all devices except the iPad 2.
Here’s a disclaimer and information
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* Supports iOS 5.0 BETA 5
* Supports the following Devices:
– iPhone 3GS
– iPhone 4 [GSM]
– iPhone 4 [CDMA]
– iPod Touch 3G
– iPod Touch 4
– iPad 1G
* THIS IS INTENDED FOR DEVELOPERS ONLY!!!
* UNLOCKERS SHOULD STAY AWAY!!!
* This is only a TETHERED jailbreak !!!.