One of the reasons I've been so quiet recently is I've been working on a piece of software called Glancing. It's intended to enable, online, the everyday, background noise of affirming social transactions amongst groups of friends. It's by no means finished, but I've got far enough to know that it's pretty much going to work, technically and socially.
I've written a short hypertext on the rationale and thoughts behind it, covering the theory and details of the functionality, interface and purpose: Glancing notes. It's a bit of a braindump, and I'll welcome any feedback (also pointers to places that need clarification/explanation) or thoughts.