How to Make a Semantic Web Browser "Two important architectural choices underlie the success of the Web: numerous, independently operated servers speak a common protocol, and a single type of client—the Web browser—provides point-and-click access to the content and services on these decentralized servers. However, because HTML marries content and presentation into a single representation, end users are often stuck with inappropriate choices made by the Web site designer of how to work with and view the content. RDF metadata on the Semantic Web does not have this limitation: users can access the underlying information and control how it is presented for themselves. This principle forms the basis for our Semantic Web browser—an end-user application that automatically locates metadata and assembles point-and-click interfaces from a combination of relevant information, ontological specifications, and presentation knowledge, all described in RDF and retrieved dynamically from the Semantic Web."
Some thoughts on RDF rendering had some ideas on visualizing the Semantic Web too.