The website, which is not associated with Valve (although is WHOIS registered to Mr. ‘Gaben Newell’), presents you with a pessimistic looking ‘NO’, that is, until the day ever comes when the next Half-Life is released.
And if this is not enough for you, the Valve Twitter community has had it’s fair share of Half-Life 3 ‘checkers’ for a while now:
@IsHL3OutYet on Twitter
It may just be a matter of time before telecom companies become part of the hype for checking the status of the game, imagine a ‘Is Half-Life 3 Out SMS service?’ or what about a UVB-76 style radio broadcast where instead of the buzzes there is just a constant voice stream saying ‘no’ in morse code.
Nevertheless, at least we can continue now remind ourselves that the wait for next Half-Life sequel is becoming, well, even more longer!