A very simple one...instead of a mapping of names to ip addresses (which would be usually be very static), instead map a name to a content address (like a bittorrent address or a git SHA1).  You create your website (or whatever) and publish all of the content based on their content address (when browsers support it directly, links could even be based on the content address).  When you need to update your site, you update the namecoin entry to map to the new content address.

This can decouple websites and other content from the physical topology of the internet.