The opacity effect on the header is too big change it to %50 so you can see mario better.
The name of the site has to be placed on the left side of the header.
The grey doesn't match the blue use a blue tint in place of the grey.
awsome site. Personelly I would make the top banner a flash banner, but thats just me. I think it would catch the eye well. Keep users interested. There are allot of cheat sites out
there.
The header looks nice. Colour combination is okay. But I don't like the navigation bar in the left side of page. You may add some more effects and align them in the ascending order of their characters length to look good.