Anyone with Steam might have noticed the somewhat recent Steam Trading Cards Beta that has been added.
The system works by giving you Steam 'cards' when you are playing that related game. You only get a few limited drops, for which you must trade or buy the remaining cards.
Collecting a whole set and crafting them gives you a unique steam emoticon, background and Steam exp for that game.
Personally I'd love to see some Sam and Max cards, backgrounds and emoticons! ;)
How about you guys?