I carry five or six index cards with me all the time, help together with a clip and a pen. I use it for note-taking, and I noticed more and more that people take the pen and start writing on the cards too, when we're talking. I like how simple and communal this has become.
Occupy Offline is a really simple idea about how connected our lives are, and celebrating the times when we're offline. It's open-source (of course), a bit political, and something small and visible based on an idea - something larger and invisible.
I used to make helpful robots, the kind who would tell me when the trains were running late (https://github.com/suttree/trainee), but also these two, Castor & Pollux, who read the websites I *should* be reading, to help me find out interesting things online, not just stare at pictures of kittens.
bliss was one the first experiments I made in dealing with opposites - what would the opposite of foursquare.com look like? What does it mean to share your location but not your identity..