I also would like to emphasize the value of a demo. Feature lists and videos do not let me control the experience and get the answer to my questions as quickly. Also, make sure to put it at the top, in the same bar as your logo.

Many times, I have bought a service over another because of the speed at which I can see exactly what I get. I want land on your page and be able to see demo, right off, and immediately see the concept, design, and layout. No ready, watchy, or thinky, just clicky.