Well only if you're a PC gamer as NVIDIA sponsored it.

Too bad they weren't kind enough to give Xbox 360 CoD 4 players the Variety Map Pack for free as well.

Anyway, I'm going to go back to deciding whether to use MS points to get some XBLA games or some new maps to frag on...

Source

thts harse since all xbox gamers had to pay points! damn them..... in the game of the year edition coming out (or is it already out) the maps are included for the 360 so they shoulda made them free across the board