I suppose this is a good opportunity to let you guys know that the project IS very much alive and kicking still, and we've just released a new set of invites today (which I suppose is why we got posted to HN today, thanks!)
We've been very busy with coding and work, which is why we haven't really been updating the blog, but if you have any questions I'll be happy to continue answering them here
edit: FYI, the original discussion is at http://news.ycombinator.com/item?id=1538731