Well not really, it looks good. But here are a few things for aeshetics that could be done but not necessary. On the rounded top above the logo there is a little corner pointing out. The header is one pixel to far to the right, this should fix the problem.
One the drop down main nav children make them the same width as the parent and round the bottom corners of the last child to match the top corners of parent menu item, meaning on hover. Also put a 1px bottom border on each of the drop down children. On you sidebar menu instead of squares for bullets use >> or something else.
Again the site looks nice and clean good job.