I am willing to trade Half-Life 2, for any game worth the same price, or a little more, depending on what you want. I will need proof of purchase, and make sure it is in your inventory, humble bundle, or something of that nature. I would require you to send your game to me, first a screenshot, or tell me what your steam name is, then I will talk to you about what I am willing to trade you for. If the game is on sale, I am willing to trade it for that. I would also take Viz for it. PM me the offer, and reply to the thread. I will let you guys know if you are making a good offer, or if I would want a little more. The game is in my inventory, and if you need solid proof, PM me, and I'll give you my steam name, and you can see for yourself!

So games I really want: Mirror's Edge, Assassin's Creed II, Battlefield II: Complete Collection, Crysis II (Currently a week-long deal!), Tom Clancy's Ghost Recon Future Soldier (Costs a little more than Half-Life.)
If you want to pay Viz for it, I would like something in the area of 40k-50k. (40,000 to 50,000 Viz.) 

The transaction/ trade must be done on steam, as the game is in my inventory, if you don't have steam this won't work!

Well unfortunately, I don't have any of those games, and the games I do have, I can't list since I'm on my phone. Go to earthwarriors thread, I have the exact same games that he is selling as keys. If you would be interested in any of those, I might be able to offer 1, maybe 2 of those games.