Building the 'event sphere'

If calendar interoperability really is going to happen, it'll probably be in part because of the work of people like Brian Dear oF EVDB, a startup service that lets anyone publish event information, then subscribe to it, in a structured way. I talked with Brian last month for Opening Move. Not a solution for individual-to-individual calendar sync, but definitely a nice step in the right direction, and the price is right (free). I give EVDB a Swampdrain Factor of +2.