I like this format a lot - the discussion / real time aspect is great and will really help to preserve some of the problem solving that occurs within groups and organizations. I had fun responding to a question - until I figured out what the closed icon was and that it had been resolved hehe.

Could be my browser (FireFox ESR) but having only one line for the reply by default is a bit cramped - I only noticed the click-box to expand the text editor a bit later.

Nice work!