I also have some Steam keys to trade for cards. Check my SteamTrades[www.steamtrades.com] topic!
Oh, by the way, I made SteamTrade Matcher[www.steamtradematcher.com], which is a website created to help trading duplicate Steam community items (cards, emoticons and backgrounds) with other traders from the site and your friends easily and quickly. If you enjoy trading cards and crafting badges this might be the website for you!
Please don't add me randomly to ask for freebies, you won't get anything. Don't waste your time.