Create a custom search engine (or engines) of your own. Check out the article on how to build a truly useful search engine - one that might be more useful for your purposes than using the standard Google search - for any given occasion or objective.
Divvio Inc., will turn on a service that automatically finds audio, video, and, eventually, text, on your favorite subjects. Then it weaves these clips together to create personalized multimedia channels that are updated each time you sign on.