Aaand... On-topic again.
Somewhere around 20-30 for Gameboy (I started on a Pocket), 10 for Nintendo 64, ~28 for GameCube, ~16 Wii, 7 PS3, 9 PS3, and cheating at 100 between my Atari Flashback 1/Atari Flashback 2 system.
I had a 2600 until I was four and my dad chucked the thing because of a bad power transformer, and around 32 games, I think. To this day, it's the only system I can think about and get all teary-eyed over because it was just such a beautiful machine.