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.
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Arun Dev is the blogger, Android Fan and passionate about Mobile apps. He is currently using the Nexus 4. For more info you can follow him on Google+