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ValveTime.co.uk | Valve News, Forums, Steam
On a part of Gamespot under the community beta part, it lists the most wanted games, the most tracked, the most owned, and the most currently played. When half-life 2 shows up on the lists, the date reads 2004-08-01. Check it out on the bottom of this page: http://forums.gamespot.com/gamespot/index.php
Even though this is a beta page the release dates on GTA san andreas or Halo 2 are still @ thier predicted dates that were decided around E3.