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ValveTime.co.uk | Valve News, Forums, Steam
Well it looks like Rick is copy-and-pasting a stock answer to multiplayer questions at this point (not that I blame him). Two people have already pasted it on the "info from valve" thread, so I won't be redundant and put my email there. The reply is interesting enough to start a thread on, though, IMHO.
Here's what Rick had to say (to at least three of us):
The Source engine contains support for multiplayer gaming, and Valve
plans to release several multiplayer games at the time HL2 is made
available. This week we've announced Counter-Strike: Source. We will be
more releasing information on the other games and how they will be made
available to gamers in the coming weeks.