I don't have my spare Skyrim card anymore, so I only have a L4D2 profile banner to trade for it D:

I have Dead Island, looking for Chivalry or Bioshock

I don't have the badge yet but need Football Manager, any left?

Thanks Kasz! I don't need any cards now

Still have Chivalry, KSP and Prison Architect. I give them away for free, although Maxwell and Poison Apple from Scribblenauts Unlimited would be highly appreciated.

Update

Trade:
Dead Island
Football Manager
Kerbal Space Program 3x
Prison Architect 5x
Reus 2x
Skyrim
Tomb Raider 5x
Torchlight II 3x

In return:
Members who don't have the Summer Sale Badge yet can get cards for free
Members who already got that badge should please give me anything they don't need anymore

damn i can trade in 4 days! i have 12 cards but only 4 different thx to steam lol.

with your cards i would have 9 different and would only need chivalry

I sent you a trade request a few minutes ago as I wanted to test if I can just give you some cards without getting something in return but the trade window didn't open. You can't trade and I can't sell (Steam tells me that I'm only reliable to use the market on Aug 11th at 15:57:33 GMT+2 and not a second earlier). Feels like being monitored by HAL 9000.

HAL: I'm sorry, Dave. I'm afraid I can't do that.
Dave Bowman: What's the problem?
HAL: I think you know what the problem is just as well as I do.
Dave Bowman: What are you talking about, HAL?
HAL: This mission is too important for me to allow you to jeopardize it.

I know it's a stupid question but, how do I gift someone with a card?

I've done it with games, but I've never done it with cards.

^ Trade the card and get nothing in return, i.e. you put a card into the trading window, the other guy doesn't and both accept the "trade".