Despite having a humungous "to do" list of games, many of which I've never even looked at (being a PS+ member helps) I have a tendency to play the ass off the same games, particularly GT6 and Salt:
PS3
GT6
Capcom Arcade Cabinet (17 old Capcom arcade games, was briefly massively reduced in price on the PS Store)
PC
Test Drive: Ferrari Racing Legends
Salt (early access strange piratey-survival game which I am slightly obsessed with)
Zerahypt (very strange free game, well worth a look, search for it on Youtube, most of the videos have DL link)
Vertiginous Golf (awesome steampunky mini-golf game which has finally seen full release, got it for $12 with several other games as part of the Humble Bundle)
Android
Angry Birds/Angry Birds Seasons (never gets old, only now got around to trying for 3 stars in every level)
Monument Valley
Hill Climb Racing
Does Not Commute
Threes