An Android phone features a unique lockscreen, where you have to connect various dots to unlock your phone rather than enter in a passcode or slide to unlock. There are 9 dots in total, and gives a little extra security just incase your friend happens to look over while you punch in your numbered code.
Just released to Rock and Cydia, comes AndroidLock, available now for free. This iPhone and iPod tweak will transform your iPhone lockscreen into an Android styled lockscreen where you connect dots in the same manner to unlock your phone. Simply draw the pattern to unlock.
After installing it, go to Settings > AndroidLock, to set the pattern. Requires 4 or more dots to be used.