We are working already on saleasfore integration. NoSQL databases like MongoDB and CouchDB are supported already. Geo coding API used in this example is Yahoo! PlaceFinder
Great analysis. Sustainability is pretty reasonable. There are tons of high quality posts on HN; if you don't gain points fast enough, you disappear from the first page too fast. BetaList has twitter integration which has a much more sustainable effect. What puzzles me is the lower willingness of visitors from HN to provide feedback.