Redsn0w 0.9.5b5 has been updated to Redsn0w 0.9.5 B5 with support for Windows to jailbreak iOS 4 GM on iPhone 3G and iPod touch 2G. You can also use the optional support to enable multitasking and wallpapers on iOS 4.0 on iPhone 3G and iPod touch 2G using this latest release. But note that this release is strictly for official activated iPhones, if you are using a hacktivated phone, stay away from this release.
Download Redsn0w 0.9.5 B5 for Windows
Download Redsn0w 0.9.5 B5 for Mac