I feel that the forum interface, while it looks very slick, is not easy to understand. For example, there are things that one needs 'reputation' for, or so I think... but that's not explained anywhere. Marking as resolved is indeed hard to find, and apparently (some? all?) posts can be tagged, or at least I sometimes see posts that have tags. But I have no idea how to do this, or whether or not I even can. It's not clear who the moderators are, either. There is a list, but I can't see it in the forum when they post.
I'm basically flying blind here as a forum user. In other words, there's room for improvement.