Apart from the links listed above, if it is books you are after I can highly recommend:
Semantic Web Programming by Hebeler et al
Semantic Web for the Working Ontologist by Allemang and Hendler.
Hebeler et al. give a quick intro to the semantic web stack as well as to a number of frameworks that can be used to hack the semantic web. Throughout the book they develop a sample application based on ontologies as well as some of the frameworks they discuss and provide plenty of code examples to get you going.
The Semantic Web for the Working Ontologist is a great - and again - practical introduction to RDF and OWL as well as to some of the principles of ontological enginnering. Allemang and Hendler provide modeling examples, point out modeling pitfalls in a very helpful way. The book is written in such a light and chatty style that I would almost recommend it as bed-time reading. In spite of that, it is always profound.