ok well, coming from someone who actually studies film, I can tell you this and most other claims about product placement in this thread are b/s. Filmmakers (and video game makers im assuming too) want to use certain products to effect the image of the film. Companies pay, but not always as much as you think, and yes, the filmmakers often do want to have those products in their films.
That being said, product placement is fucking shameless and only low-lifes like michael bay would resort to it.