So, I had made up this example of a hypothetical "Book finder" that one could make with Semantic Web type tools. But with a few more hours to poke around I could have found BlueOrganizer, a real live working Mozilla add on that does lots of things along those lines.
It's many things, including an online-bookmarking tool and a right-click context menu that provides links to lots of popular Web 2.0 services. But what makes it Semantic Webby is that it offers different options depending on what it finds on the page: books, recipes, music, wine, and a bunch of other categories. It doesn't rely on RDF or other markup to identify these things as far as I can tell, it just seems to make good guesses by looking at page content, possibly matching against a list of known text strings, and using information that users have provided when bookmarking pages.
It also does some simple ontology-related things, mostly sub- and superset choices from what I've seen. For example, when dealing with books it offers options based on the specific book and on the book's author. For web pages, you can look for more info about the page or about the site. For recipes, you can search elsewhere on the recipe title or on individual ingredients. For travel destinations, it offers options based on the city or the country. But I don't see any fancy things like searching multiple sources and sorting the results for you.
(Note for Semantic Web watchers: it seems like popular SW hypotheticals tend involve books, travel, wine, or recipes. So whatever the eventual "killer app" turns out to be, it seems likely that it will combine all these. ;^)
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