I really like the logo, it fits well with the overall style.
The portal page is very crowded, even when using the liquid skin. If you cut back on the content there and added some spacing between the blocks it would really help the look.
The style is dark, but easy on the eyes. You offer two version, fixed and liquid, which is a great Quality of Life feature. A light version of the skin would be nice, but the current one is very well done so you probably don't "need" it.
The forum icons are nice, but very random when put against the dark skin. They stand out, almost too much. I do not think this is a major issue, but something you may want to keep in mind as you add more forums.
You have a good amount of posts in all your forums, and what looks to be good traffic. Great job so far