Thanks to the combined efforts of AriX and westbaer, they are releasing a version of GeoHot‘s purplera1n jailbreak for the  iPhone 3GS for the Mac. Both Windows and Mac versions have also received payload stability improvements, updating the the Windows version from RC2 to RC2a (although there’s no reason to use it if you already have RC2 installed). You can get both the Mac version and the new Windows version at purplera1n.com.

Direct download Links:

Windows : http://theiphonewiki.com/purplera1n/purplera1n.exe

MAC : http://theiphonewiki.com/purplera1n/purplera1n.zip

[Via iPhone Alley]