Android Froyo is one of the finest update from the Android family till date. Now you can experience Froyo right on your iPhone 2G / 3G using Bootlance from Cydia. I haven’t tried up with bootlance, however its one of the best known method for installing Android without affecting the iOS installation. If you want to give a try for this, here is a nice video demonstration from Redmond Pie rel=“nofollow>.
Note: To install Bootlance, you need to have a jailbroken iPhone in order to access Cydia store.