My faves are- Single tap; Orbital Mr AahH! Frenzic Apocalypse Zombie Fish (it's awesome) Swipe; GeoSpark Ramp Champ Paper Toss: World Tour Tilt; Boost 3D Labyrinth 1+2 . Series Tilt + Tap; Doodle Jump Crazy Turkey Blast Hot Dog down a Hallway (FREE)
Our upcoming game "Age of Tribes" is a one-finger-only game...I really love a simplified gameplay. No matter if right or left handed. There is no need for gestures or a full featured gamepad emulation.
I play BG with just my thumb (i.e. in one hand, with my thumb controlling everything). Does that count?
Hook Champ probably could be used as a one-handed game... I thought that one was pretty good. Other than that, all of my options had already been placed on the original list.