Serialising Java Objects to RDF with Jersey Jersey is the reference implementation of JSR311 (JAX-RS) the Java API for RESTful Web Services. In short JSR311 makes it easy to publish graphs of Java Objects to the web, and implement update and POST semantics - all this using simple java annotations. It makes it easy for Java developers to do the right thing when writing data to the web.
RESTful Web Services: the book That's RDF for you. It's so simple I am able to explain it to people in bars within a minute. Here is an example, which says that my name is Henry: "Henry Story". Click on the URLs and you will GET their meaning. Since resources can return any number of representations, different user agents can get the representation they prefer.
The Sun BabelFish Blog: Aperture to the semantic desktop Aperture is an open source library and framework for crawling and indexing information sources such as file systems, websites and mail boxes. Aperture supports a number of common source types and document formats out-of-the-box and provides easy ways to extend it with custom implementations.
Aperture does pretty much of what Apple's Spotlight does currently, except that it only works on the local file system. Just as with Apple's Spotlight, the crawled information can then be queried. But unlike Spotlight, it could be done using the much more powerful W3C standard SPARQL query language.