Looks very professional. The text on the logo looks a bit strange though, you could try to use another font maybe..
i dont understand the logo either.. header looks too plain... i think there's a slight problem with the chatboard on your homepage,,there's too much space under the forum categories..
Nice colors and portal layout. Shoutbox needs padding. A mod to phpbb to make the block highlighting clickable to enter a forum/topic would be cool.
What about flow from the portal? Is there anything we can do to increase conversions without damaging the functionality of it?