I separate the experience of creating "a website that differentiates" from creating a website. In 2009, anyone can create a website. Surprisingly few can create a differentiated website. What are the characteristics that make a website differentiated?
Brand strategy - brand strategy or positioning are fancy terms for professional differentiation. Listen to your customers, incorporate that intelligence into your own language and practice, share the kool-aid with your organization and feel great about being able to explain what you do with confidence while riding the elevator and talking to an impatient prospect. The website will come so much easier and faster when the brand is right.