My first impressions are:
- font size is very big, though it may make sense for an eyestrain forum
- compared to average forums, few text and items fit on the screen
- currently it looks like there is no particular thread order (apart from the tag system), it looks rather chaotic (this sounds harsh - I'm a native speaker, didn't find a better word; hope you get what I mean)
- maybe a more conservative approach would be better: grouped sub-forums, sticky topics and such
I'm not saying you should change anything, it's just my first impressions I wanted to share.