Panzer Bonanza: 5000 Heroes & Generals Keys
UPDATE: Having some odd issues with the key dispenser, looking into it.
Impressive multiplayer World War II project Heroes & Generals has reached its "hey, everyone, let's beta test" stage, and we'd suggest you take a look. Reto-Moto have been working like heroes (and generals) for years and months to get this game into the state it is now, which is pretty impressive. You'll glimpse a bit of that by taking a look at the video below, or indeed grabbing a key from here and playing it for yourself.
And here's some information about the latest build of the game.
(Check out that map at 1:47.)