When it comes to combining the largest number of gaming buzz words, you'd be hard pushed to include more than Gedda-Headz. It's a free online multiplayer game that mixes up social community, physical collectibles and cross-platform - iPhone, iPod touch and Java - compatibility.
How it works is that you download the app and buy one of the 36 available Headz. Actually when you buy a Headz can, it contains three different Headz so you can share them with two friends. Each one also comes with a dog tag, explaining their attributes - toughness, cleverness and swiftness - and a unique code so you can upload that Headz into your game.
You then level up or trade Headz by playing Bluetooth and online games with other players.