This is definitely a nice-looking style, but it would be much better if the rounded corners (which are awesome, btw) were all throughout the skin.
For example, when you go
inside of a forum, the bar right below "new thread" is a rectangle and just doesn't fit the style at all.
Also, the tables have no borders and there is entirely too much whitespace. Perhaps making the background a light shade of blue-gray.
Just some little tips for you.