Steam Trading Cards

So Steam recently released Steam trading cards for Steam games. How many of you are out there collecting? How many of you are selling them?

I plan to just keep them and sell off any doubles. So far I've only earned cards for Bit.Trip Runner and Psychonauts but plan on earning more.

I have a Left 4 Dead 2 Hunter, Reus, Team Fortress 2 Medic, TF2 Spy, and Tomb Raider 'A survivor is born' for trade!

I sold off my summer doubles to buy the torchlight 2 one to get the badge. I've been playing puzzle quest 2 and haven't started on anything with cards yet. I could go on a cheevie / card hunting if anyone wanted on one of the multiplayer games (i'm sure most of us have about the same games).

Left Indie Game: The Movie running earlier today since I've already watched it. Picked up 4 cards and 4 achievements. As for what I can trade:

These are the extras that I have -

Indie Game: The Movie - Tommy
Skyrim - Summer Getaway
Dead Island: Riptide - Summer Getaway
Bioshock: Infinite - Summer Getaway
Kerbal Space Program - Summer Getaway
Prison Architect - Summer Getaway

If anyone wants to trade for these, just let me know. I'll hopefully have more cards soon.