Wow, xmarks is dead because they couldn't "find a scalable business model" with two million users. http://twitter.com/PinboardIN/status/25734453850
xmarks: @PinboardIN hey if you've got some good ideas, we're all ears! and, of course, pinboardIN: @xmarks the model that has worked well for us is 'charge people money for a useful product or service'
edit: source, patio11: http://news.ycombinator.com/item?id=1668553