I took a quick look and found a couple I like:<p><a href="http://basecamphq.com/tour" rel="nofollow">http://basecamphq.com/tour</a> -- Highlights each feature with a screenshot, with a link to a demo video.<p><a href="http://www.freshbooks.com/tour.php" rel="nofollow">http://www.freshbooks.com/tour.php</a> -- Screenshot only tour, but shows screenshot for each section of site, then breaks down the features in each section below.