Well, if you have iPhone 3G, iPhone 2G, iPod touch 2G or 1G and you would like to try using iOS 5 on the referred devices. You can do it using Whited00r which will allow you to upgrade your firmware to iOS 5 with these old devices and enjoy the the speed up difference and the other advantages. Download Whited00r 5.1 from  the link below.

Happy News for iPhone 2G and iPod Touch 1G owners, Some developers has successfully created a Modded 3.1.3 Firmware to replace iOS 4 on iPhone 2G and iPod Touch 1G, This project called "Whited00r" and it brings a lot of features of the iOS 4.
This Modded Firmware (3.1.3) brings this features: