Well, right away I notice how the logo (http://www.datacentersearch.com/temp...mages/logo.jpg) has a white background while the rest of the website has a gray background, doesn't go well together. I feel your navigation would be more effective if it had rollover elements that let the viewer know what page they have selected.
Also, I don't understand why there is half gradient effects over: Regular Link, Categories and Featured Link. I think that's another element that sticks out like a sore thumb.
I'm sorry if I'm being mean because that's not my overall objective. I'm trying to give you constructive feedback so you can improve your website. I know you want advertisement on your website and I can't say I blame you but at what expense? I think the way you have your advertisements arranged now is bring your website down. I feel like the overall website is 'side' (left and right) heavy. Best of luck to you and thank you for sharing your design. I hope I've been helpful.
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