This website helps you identify unexperienced Team Fortress 2 players with valuable items. Trading with these people will often result in better deals than you would get normally. All you have to do is follow these steps:

1. Join a server.
2. Open the console (enable it in the options), type "status" and press Enter.
3. Copy-paste the resulting list containing SteamIDs (they look like STEAM_:X:XXXXX) into the field below.
4. Select your options.
5. Identify your victims!

Click a victim's name to visit their profile, and clicking an item shows you his/her entire backpack.

Note that hats are always sorted before weapons (a Unique quality hat will always appear before a Vintage weapon, for example), and Unusual hats are considered the best quality.