nice website, looks professional. you should change the Title from Index page to the name of your site.. add more categories, promote your site. good luck
I wonder if you can put something at the top to make you different then all the rest. Why should I spend time on your site? Do you have anything unique to offer? Definitely need an edge somewhere.
Offer targeted users "admin" control with ability to advertise their own product/site. Create a JV scenario. Colors aren't bad. But they don't seem very saturated. Too pastel for my taste. Logo needs to be more pronounced!