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Your header where your contact information is, is very misleading. They will very easily be mistaken for main navigational buttons. This also renders your black navigation bar extremely out of place.
As with other comments, and contrary to what you believe is needed, you DO NOT NEED all the information on the homepage. Countless user behavioral studies and heat maps have shown that no one bothers with all that content, especially on the homepage. Users want to find something that relates to them, click on it, then find out more.
you may also have made a mistake on the top half layout: your image banners are: web, pay, graphic, SEO. Your colored boxes below that are web, pay, search, graphic. Both rows of which don't line up with each other.
Finally for the main content layout, if you're not using the left column for sub navigation, I'd suggest you move your main content to the left, and the additional adds/banners/panels to the right. This was, users can focus on your content FIRST, then look for any other value-add on the right.
