Every day leading up to Christmas, the Appvent Calendar will feature one free iPhone game. The game will only be free the day that it debuts on the calendar, so don't wait too long to download. Some of the games that have been released thus far include Samauri: Way of the Warriors and Smackbots.
This is a pretty cute promotion. Not only do iPhone users get access to some free games (and hey, free is free, right?), but smaller app developers get some promotion. With all of the competition in the App Store, it's nice to see developers working together to get the word out about their games, while also giving users a nice holiday treat.
If your appetite for free iPhone games hasn't been sated, we absolutely must recommend another iPhone game that is free for a limited time -- Ramp Champ (iTunes link). This is absolutely one of the most addictive iPhone games out there and is just tons and tons of fun. Get it free while you can!