I agree with Pokermonger. Slick design is one thing; useful content is something else.
Take a look at sites like http://www.cockeyed.com or http://www.learn-texas-holdem.com. Not much to look at, design-wise, but in terms of usefulness, look out!
Another example? Google. Their design couldn’t be more basic, but they have traffic because they’re useful. (And I’m sure that will inspire a rant about how awful their search results are, but that’s beside the point. The point is that the design is super-minimalist and the content is useful.)