Yup, that's right - October 9th, 2007. Genteel of Shacknews as it went to the notice of us:

"Last night, Valve representatives confirmed to Shacknews that the studio's upcoming trio of Source-powered games will ship for all announced platforms on October 9, 2007. The suite, sold at retail and through Valve's Steam download service, will consist of the shooter sequel Half-Life 2: Episode Two, the team-based multiplayer game Team Fortress 2, and the action/puzzle game Portal. Valve is handling development of the games on PC and Xbox 360, with EA UK's Chertsey, Surrey office bringing the titles to PlayStation 3."