I was a little confused when I first arrived on your site. All of the different words and taglines danced around what it is you really do. It says "Advertise Here," "Advertising Made Easy," "The Advertising Marketplace," etc. The big map could have been from any number of businesses. Since this is the internet and advertising is everywhere, seeing the words "advertisement" don't really tell me anything. Is it online?…
Do you like the saying: "Advertising Off-line"?
If you settle on a tagline you might think about using some imagery that represents what you do -- college newspapers, billboards, restaurant menus, etc.
A picture may not be worth a thousand words but it can usually replace a paragraph . . .