Well it seems that Valve (at least right now) isn't interested in developing for the PS3. I find this a bit odd solely based on the fact that their games (their FPSs) are so obviously designed for a mouse and keyboard. Which console supports mouse and keyboard play?...That's right, the PS3 supports it, but Microsoft still support this. It is a bit ironic because all the games that can benefit from this set-up are dominantly on the 360 at the moment. Most RTS console games are for the 360 only and everyone knows that the 360 is a shooters systems so why not give us the option?...
I digress, the fact of the matter is that Left 4 Dead as of right now will not be coming to the PS3 anytime soon (possibly never) and that is quite the shame.
Valve: Left 4 Dead may come to PS3 eventually