Resources untuk belajar tentang Semantic Web

I found good resources to know more about semantic web and semantic web technology such as the definition of semantic web, RDF, Ontology and also how to use protege. Here is the addrees :

1. http://www.semanticfocus.com/blog/entry/title/introduction-to-the-semantic-web-vision-and-technologies-part-1-overview/ : an overview of semantic web
2. http://www.semanticfocus.com/blog/entry/title/introduction-to-semantic-web-vision-and-technologies-part-4-protege-101-screencast/ : Tutorial to create ontology in Protege using video presentation (part 1)
3. http://www.semanticfocus.com/blog/entry/title/introduction-to-semantic-web-vision-and-technologies-part-5-building-owl-ontologies-using-protege-4-screencast/ : Tutorial to create ontology in Protege using video presentation (part 2)

And for the complete information just visit http://www.semanticfocus.com

I really got that this tutorial is usefull a lot, even for beginner.