Despite the fact that the first Google Android-based handset isn’t going to hit the shelves till late 2008, and there are reports of some bugs, developers have started to tinker with Android, and have started coming up with applications or application concepts. Maybe it’s the $10 million contest that’s got the tinkerers tinkering. Regardless, check out this one, called CallFreq. The demo shows that you can sort your contact list by the frequency of calls you make by the hour, day, week or month. Maybe these guys should make this app for the iPhone when the iPhone SDK arrives — it would be an ideal add-on to the visual UI of that device.