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ValveTime.co.uk | Valve News, Forums, Steam
www.1up.com has the Lost Coast release date listed as 9/30/05.
I think that might be correct as seeing they had all those special features with Valve a couple of weeks back. It seems they have a close and special relationship with Valve and Gabe.
See it yourself. Go to 1up.com, click on PC, and then scroll near the bottom of the page, towards the right.
RELEASE DATES
GAME PLAT DATE
Black & White... PC 09/30/2005
MotoGP 3 PC 09/30/2005
HL2: Lost Coast PC 09/30/2005