But my friends don't have it for the PC so I got it for the 360 and adapted to it...I'm a lot better on the 360 than the PC though...the keyboard cramps my hand if I play it too long...which I do :P
Have you seen Retaliation? CoD4 machinima, made on PC. It's absolutely kickass! Course, it could only have been done with PC, seeing as there's a FRAPS usage overdose.