Calais is a web service that uses natural language processing (NLP) technology to semantically tag text that is input to the service. The tags are delivered to the user who can then incorporate them into other applications - for search, news aggregation, blogs, catalogs, you name it.
WorkLight is a secure and scalable server software product that creates a bridge between the traditional IT environment and numerous consumer-oriented Web 2.0 services and technologies. On the one hand, WorkLight connects to enterprise applications, data sources and security infrastructure. On the other hand, it interacts with a wide set of familiar Web 2.0 services and protocols, such as RSS, Ajax-based gadgets and widgets, personalized homepages, instant messaging, mobile devices such as iPhones and Blackberry, and tagging and bookmarking services.
The Resource Description Framework RDF allows you to describe web documents and resources from the real world—people, organisations, things—in a computer-processable way. Publishing such descriptions on the web creates the semantic web. URIs are very important as the link between RDF and the web. This article presents guidelines for their effective use. We discuss two strategies, called 303 URIs and hash URIs. We give pointers to several web sites that use these solutions, and briefly discuss why several other proposals have problems.