Steam trading feature goes live

Valve has launched its new trading feature for Steam, allowingcustomers  to exchange in-game items and gifts with other Steam users.
 
The new trade system works for Valve games Team Fortress 2, Portal 2 and Sega’s Spiral Knights. The studio says it is working with other developers to expand the service to other games.
 
The new item inventory can be accessed through each customer's community profile.