Black Cloud

http://www.gregniemeyer.com/

Greg Niemeyer, an artist at UC Berkeley has an excellent blog going in which he outlines his recent projects. As you might guess from its title "Free Change", Greg actively promotes an open source aesthetic in his artwork. We get to see the conceptual and technical problems in his work hashed out in a well written and engaging manner.
Currently Greg is knee deep in "Black Cloud" a pervasive game that will be played out on the streets of L.A. this summer. Greg and his team are using custom build Arduinos wired to cell phones to send realtime data via SMS to the players. Should be fun, but I think the game is limited to teenagers (they get all the fun).
His site looks good too, right down to the carefully chosen font.