As I mentioned here and here, one of the most appealing aspects of the G1 phone is the openess of the platform which allows developers to get really creative when it comes to apps that leverage all the features contained in the phone.
One company worth mentioning is JOYity which was recently covered by TechCrunch. They are leveraging the GPS capabilities of the phone, allowing users to engage in location-based games such as YouCatch, Roads of San Francisco and City Race Munich).
The most engaging by far is YouCatch which is an enhanced version of Manhunt. The concept is pretty simple: you and a handful of friends sign up to play the game, and then each one is randomly assigned a target, making everyone both a hunter and a target.
I hope they add voice features soon, which could allow you to play the game in a less obvious way (running around watching a phone screen kinda give you away) and maybe even team up with others for the hunt.
Here’s a quick review of the game and the interface:
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