The design needs to be a little more graphically interesting. The only contents on your home page are link buttons and centered contact info text - it looks more like a "Contact Us" page than a home page.
On your interior pages that are text heavy, the liquid layout makes it very hard to read your text from side-to-side on my wide screen. Set the width of text to maybe 500px and break it up with another column or some kind of interesting graphics.
The home page of your Agora Cart needs some photos or content (I was staring at a blank white page, waiting for something to appear). You also need to provide a secure area for shopping and check-out. I added toner to my cart and, when I went to check out, I never went to a secure area (no padlock, no https:// ).
In regard to
SEO, your tags contain lots of "fluff" words and not enough keywords (your Description is an example). Poor keyword density overall - "solutions" is your #1 keyword, for example.
You're also missing a <!DOCTYPE> declaration.