I don't know if it's just me, but I find the fact that the rooms re-order their position slightly irritating. The active room always makes itself the first in the list (after the room list). When you select another room, the room you were just in is then pushed to the right one space. This means that the rooms are constantly re-ordering themselves based on when you last visited them.
It's only a heuristics thing, there's nothing wrong with the site, it just means you have to spend more time looking for things when you knew where it was a moment ago.
Seems a bit counter-intuitive to me, based on existing behaviour in other applications. Or am I just being picky? ;)
Additionally, is it possible to make "Community Center Chat" always the top of the room list? Seems to be the general congregation place of members :)