I was actually just playing Gumboy and came here to see if anyone had heard of it. Quality game.
I really hope the advent of the Xbox Live marketplace and the PS3 equivalent lead to more games like flOw, Gish, Gridwars, and the like being developed and tested as pc freeware/shareware games and then moving over the consoles. Seems like everyone wins that way. PC gamers get great games, console gamers get great games, and these developers now have an opportunity for more exposure and more money.