Love, a one-man indie MMO
Jim Rossignol has written an article over at Rock, Paper, Shotgun about Love, a 'first person not so massively multi player online procedural adventure game' developed by Eskil Steenberg.
The game itself, dubbed Love (as in For The Love Of Game Development), is an exploration-based moderately-multiplayer FPS with astounding impressionistic visuals and a procedurally generated universe. Since Steenberg is a one man show, he's relying on clever maths to build the world for him and then clever gamers to come in and help him figure out where to take it, and what to do with it.
It sounds like an amazing effort. Great look too!