David Wong’s Android hack for the iPhone 2G can be installed as follows…

blazter2k’s instructions are extremely detailed, so anyone who can read English should be able to accomplish this hack. As always, neither I nor anyone else but you takes responsibility for installing any unsupported ROM/software on your device. If your iPhone gets bricked or damaged in any way, then you are solely to blame.

With that formality out of the way, follow the guidelines from Android A Lot.