Not supporting the PS3 is Valve's decision to make, and it doesn't sound like they did it lightly considering they paid to have someone port the Orange Box. It's expensive to bring talent in-house (benefits, office space, etc.) opposed to simply contracting out a port to a PS3-savvy team, but contracting the port doesn't appear to have met Valve's standards for quality. I see this statement from Mr. Lombardi as a sort of subtle apology to their Sony customers, and a promise to not produce lesser ports in the future. True, it's not the ideal of having Valve promise to create an in-house PS3 team, but few developers/publishers are in a position to start pouring serious money into a new platform, particularly if they're staying in the black without doing so.
There are a number of PC-only developers, including Blizzard, but it's their call to ignore the 90+m current-gen consoles out there, and for many of them it appears to be a sound business model, so I'm not going to second guess them. I have two Mac's at home (I've programmed and used Windows PCs since the day they arrived on the planet, and I no longer care to own them for personal use), and I would love to have Stronghold 2, Dungeon Siege 2, etc. for the Mac, but I'm not going to criticize the publishers for deciding on their own business model. If I want to play those games that badly, then I will switch to a PC or buy Virtual PC for the Mac. Same goes with my 360/Wii... if I want to play Resistance 2, Uncharted 2, etc. badly enough, then I will buy a PS3.
