I think that this is a really good forum, however, the icons for the different sections should be changed so that they show users what they are about. Currently, they are all the same picture. This does not give me a quick indication of what they are about.
From what I remember about PHPBB, all the sections are dynamically generated from the database with no option to specify a custom icon. This means that each forum (or subforum) is given the same icon.
I suppose the template code could be modified to add the forum's name to the end of the .jpg (or .gif, whatever) but this would require a bit of digging.
The problem is that we have a lot of forums, so it would require a lot of items. Secondly, they would take quite some bandwidth. And also there needs to be some way to indicate that there are new posts.