I don't normally notice product placements but having purchased a Surface Pro recently (more to play with than to use as a daily tool) I have noticed on US TV shows the number of times I have seen the Surface Pro (or 2) obviously placed in a show for product placement purposes.
For fellow trainspotters I have seen it used in
Elementary (Holmes uses one often)
NCIS - one recentl episode had a tech hold the Surface with the main metro screen up, choose Sky Drive and then show some images of a crime scene
NCIS LA - the techs seem to use them often
Any other shows people might have noticed.
I comment also because the Surface Pro is a heavy unit and not something I would want to carry around a lot versus say a tablet.
As an aside those same shows seem to use Windows Phone devices mainly - again clearly product placement.