Master Directoy, I'm really impressed with the design here. Simple, but very effective. It really is a good Web 2.0 layout. I don't think you should alter it at all or you may risk damaging the effectiveness.
Ammmm social bookmarking site, well nice one. I bookmarked this site, when i create a new page for my website would submit that page here.
Overall it is pleasing to the eye, nice and evenly distributed to display a lot of information and topics without being overwhelming, excellent use of colors. FYI, a couple of typos on the bottom right.. should be owners, bloggers, marketers (plural)
Nice, it looks nice, all you need now is to connect more websites and bloggers to your site. And maybe some art work for the posts? Good luck with your website.