This scam is kind of similar to Memphiz's. You can basically get anything you want from MarkeeDragon that they are offering.
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Download AIM+: [Only registered and activated users can see links. ]
AIM+ allows you to be on two screen names at the same time. Yes, I know you can link your screen names but you cant be in a chat when they are linked.
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1) Go on MarkeeDragon find something that you like.
2) Contact the person over AIM and talk to him about it.
3) Lets say he wants to trade his Wow Time Card for a Steam Account. Tell him you have the Steam account right next to you ready to trade.
4) Once he agrees to trade go over on MarkeeDragon and find someone with a TrustWho positive feedback. Preferably a high positive feedback.
5) Once you have found a person with a good feedback create a new AIM name just like the person. Lets say his name is Llarry make a AIM Liarry.
6) Load up AIM+ log on to aim with Liarry, go to My Aim>Edit Options>Format Screen Name... and change the i to a capital i or l.
7) Go back on your real screen name and tell the person that you have found a Middle Man. Invite both the guy and you other screen name "Liarry" to the chat.
8) Once you get in the chat say "Liarry I reviewed your profile and your TrustWho looks good" Or something like that.
9) Then go back on Liarry and say " I don't have much time so lets hurry this up, your other screen name go first".
10) Wait a minute or two and then tell the other guy to give Liarry the Key.
11) Once you get the key and enter it. Go on Liarry and say "YOU BOTH GOT SCAMMED NOOBS!" and log off.
12) This will prevent him from thinking you were the scammer.
If its hard to understand I can explain it better.
Actually it's doubtful this would work since any half-brained person would have the MM pm him or post in the topic as confirmation for who they claim they are.
Well go find a topic made by that person or a topic that he posted in last without any other posts after his. Lets says he said "thats cool" then go back on AIM and be like okay, i'm about to post "Thats Cool" in this topic. Most of them do not check the dates on these things. You can also tell them that you don't have much time or something. I tried it and it works. Can anyone else confirm this?