Serious here: the site and overall design are terrible - there is no real "authoritative-ness" to it, and this is important when people are going to spend a couple hundred on your site. Providing a more clean layout, and adding more content will help this.
Also, like Teegs mentioned - group your products up better. Go category and even sub-category - I think the more granular you go, the better.
On the product pages themselves, can you add a reviews section and maybe even pull reviews from the manufacturer, or the advertisers site? Reviews/testimonials are important, and will help sell further. The "about the company" section on the product specific pages, fucking sucks. Add a real "about" - "Newegg has great deals on PCs." does not compel me to buy a new computer from Newegg - go at it like your customers have never heard of Newegg.
Can you add a plug-in so that the consumer can zoom into the product image further? I think this would help.
Look at other online-retailers and see what information (sales points) they give. You could learn a lot from them. Also make sure you have a smooth transition from your site, to the advertisers site.