Not bad.
I like the main menu rollovers, nice and subtle. Although the header pic looks a tad grainy. Oh, it's a .gif... -- that'd be why. GIF's can only have 265 different colours, use a JPEG (JPG/JPE), chances are you'll get a smaller filesize and you won't get that colour banding and diffusion grain throughout the image.
The header image itself isn't too bad but the completly black and white pic on the far right looks a little out of place. If you could find a different pic with some green in it you'd have a much nicer image. Red to blue to yellow/brown to green. Yah, that'd look nice.
As fo the blue/grey colour scheme, could use a little tweaking. The black 1px lines above and below the sub headings look out of place. You also have a white 1px ontline around the header but you don't continue this anywhere else. Kind of makes the content and the header feel more seperate than they need to be IMHO. Maybe try using a slightly colour tinted grey and a blue that better matches the blue in the header, should add some cohesion to the site.
Remove the Powered by Coranto link. It's broken and you just don't need it anyhow.
Get that forum in shape! I'm asuming you haven't really dome much to the forum yet so I won't bother commenting about it.
Please, oh please make your links a different colour form the main text. I really can't stress this one enough. How am I meant to know what's clickable if I can't tell it appart from normal text. And if your going to use css text rollovers try and make them stand out a little more when then the mouse does roll over the link, not blend into the background. Links are meant to jump out and say, "HAY! YOU CAN CLICK ME" Cause their text the they only thing they have going for thim is either an underline, which you've removed, or a colour, which you've also removed. Dig?