G1 screen lock?

[boolieman]

I recently found out one of my friends got the g1 i must admit not a bad device, if it is customizable as win mo it would be friggin sweet but alas its android, however i found one thing that i really liked about android, he had a screen lock that was well.. different, if youve seen it then you know what im talking about. It looks like a 3x3 grid of dots and you run you finger in a certain pattern to unlock the phone. I wanted to know if anybody has made something similar for win mo since i find myself leaving my phone sometimes in situations where people could look at whats on it when i dont want them to and it seemed like a really fast disengage the lock thing.