MapSurface is a tool that tracks user activity within a web page. Its purpose is to provide an understanding of how users find, navigate and value web pages. It displays this information in a compact widget which sits above the web page. Andy Budd has written an excellent review which is worth reading. http://www.andybudd.com/archives/2006/02/mapsurface/index.php
hReview is a simple, open, distributed format, suitable for embedding reviews (of products, services, businesses, events, etc.) in (X)HTML, Atom, RSS, and arbitrary XML. hReview is one of several microformats open standards.