Most people would tell you that if you seek the community aspect of it, you should go to Reddit, but honestly, I still feel like there's a hole for something in between. A site with the conciseness and technicality of SO but with the community and open-endedness of Reddit is something I'd definitely like to see and contribute to.
Isn't that down to just subreddit curation? Go look at askscience or askhistory, the top level responses are always relevant or they get deleted by the moderators. Nothing stops someone from making askprogramming that has that level of curation. The problem just becomes incentives, in that getting experts to write informative responses for free is hard, and once SO rating stopped mattering (like how reddit karma never mattered) people stopped trying to participate.
