It'll be interesting to see what the split is between Xbox and PC sales, not that we'd actually be privy to Steam distro sales, which will undoubtedly amount to a significant chunk of the overall PC sales.
Off hand, I want to say that the Xbox version will sell better initially, with sustained sales eventually going to the PC (Steam weekend sales will go a long way in helping this).
Personally, after paying $50 for L4D when it came out (or was it $5 off?!) and then seeing the half off sales months later, I'm inclined to just sit this one out until Steam does the inevitable 50% off sale on L4D2, regardless of how long it may take.







