I think the choice of font for the headers might be off. It works well for the title of the site, but as it gets smaller and more used it becomes less legible. I think finding a more typical sans-serif font that works well with the style of the header would be a better bet for usability's sake. To me, the grey and orange color scheme seems a bit dated, but I do think it's put together well, so don't think I'm against its use.