Have any of y'all played this game called Limbo? I didn't know about it before yesterday, when it came out in the iTunes store for iPad (and other - i-devices). It's hauntingly beautiful, in a dark and disturbing sort of way, with a uniquely monochromatic scheme and simple, lonely soundtrack and sound cues. It's creepy and macabre and filled with the kind of Myst/Riven/Portal type puzzles I like.
Screenshots here. Review here.