Regarding the Q/A and Refereeing, it is important that the questions be reliably sorted out in a tree-structured tag system, like a directory, so that people will not have to browse through the whole thing or use a search engine to find all questions/answers relevant to HighTc superconductors.
This is a problem on SE, it makes the site unnavigable over time, as questions accumulate, and people forget what is duplicative of what. I don't know if this is something that can be acommodated on Q2A software, but it is a serious concern. When a user comes here, they shouldn't see a flat list of questions, but a sorted tree of topics, which resolve into questions, or a flat list if they look at the most recent questions only.
It is very possible, if the site succeeds, that you will have order 100-1000 questions a day. This can make things completely unmanagable extremely quickly.