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ValveTime.co.uk | Valve News, Forums, Steam
I don't know if it is rule of thumb or if it's declared by law, but all release dates for DVDs (movies) are on Tuesdays - check out Blockbuster, or any movie coming out that the retailers do ads on - always Tuesdays.
I didn't think this applied to games - but weird - check it out - both Halo 2 and DOOM 3 have release dates, November 9th and August 3rd respectively. Both are on a Tuesday.
I use this logic to conclude that HL2 will be released on a Tuesday. I see threads about it coming out on Sept. 1st, August that.... I don't know when, but I bet it will be on a Tuesday!