I'm showing you how to jailbreak using IOS5 redsn0w gm. This is a jailbreak tied which means that every time you turn off or restart your iPod touch or iPhone you have to restart the system using redsn0w. It runs on the 3G and 4G iPod Touch, iPhone 3G and iPhone 4 also iPad 2.
iOS 5 Download for iPhone 3gs, iPad, iPod Touch and iOS 5 Features checkout here