Good design, site loads pretty fast. Not that much different from other directory sites though, but that's not a big deal. I think you have a typo on the sponsored links menu at the left. The 4th link from the top is: http://www.tradein>biz/
As with many directories you've got a free template skin, the only design thing that you can really do is get a decent logo designed... colour and quality wise it doesn't really fit in with the site design... perhaps something a bit more ridgid with a better suited green. As for the categories, you've got a good number and variety.