Jon Udell on Proxy power: "[...] I've been experimenting with a local Web proxy that XHTML-izes and transforms Web pages on the fly. [...] Given such a database, the on-the-fly filter could do some clever correlation. Suppose that for the pages I read -- and maybe also for each link in those pages -- the filter extracts URLs, queries the database for elements that mention those URLs, and rewrites the current page with links to the query output. Voila! Instant context."