PS3 = around 22 games or so (can't remember exactly). These are all essentially full price BR titles such as MGS, LBP, Burnout, Fallout 3, etc.
I also have around 10 to 12 PSN games. Wipeout HD, the Pixel Junk games, etc.
For Wii I have around 5 games so far. I'd get more but my kids keep borrowing our neighbours Wii titles so I figure why not save money and funnel into my tastes on the PS3...
I don't have a 360 at the moment. Not planning on one but if price drops further over next 12 months or so I might just have to out of curiosity.
Try to be reasonable... its easier than you think...