The short answer is, not very. Don’t spend a lot of money or time making it pretty. You aren’t being hired by a graphic designer: you want your words to sing and tell your story. You might have already read my suggestions on how to collect your clips into a WordPress blog site here. Using any one of their templates will be just the right amount of slickness.
In my next installment of practical suggestions for the Freelance Strategist, you can get more information about what kind of effort you need to put into your clips portfolio.