There are some useful articles that was really interesting but the template is not much impressive.The advertisment on top overlaps with the navigation menu bar and need to present good color schemes.
you need to format your design, image on article seems did not formatted corrected, and the ad banner seems overlapped with article container .
I think you need to change some other layout for your site. And also make the content to the center of the browser (Firefox 3.5)..