Over the course of Team Fortress 2's history, the game has recieved many updates. The console versions, however, appear starved of such treatment, with only Xbox 360 version of the game to recieve any support at all (thus far). However, the patches that were recieved fixed a few long standing issues with the game, and are archived below.

Console Date
Xbox 360 October 27, 2007
Xbox 360 March 1, 2008
Xbox 360 April 2, 2008
Xbox 360 July 21, 2009

While valve(Team fortress) has announced DLC, but has yet to be released.