I clicked the 2-5 option in the poll. then realized that I actually played 6.
AD&D 1E, AD&D 2E (variant/hybrid), Savage Worlds, Champions, Mutants & Masterminds, and Call of Cthulhu. Savage Worlds and Champions were strictly face-to-face, the 2E game (a mix of 2E and C&C) was all PBEM (play by email). The Mutants & Masterminds game was face-to-face for me, but one player joined us through Skype. The AD&D 1E game consisted of face-to-face with some players using Skype and some PBEM too.