If you are looking to improve your Norwegian skills and to broaden your general knowledge, then you should look at snl.no. The Big Norwegian Encyclopedia (Store norske leksikon).
This site offers free articles and writings from Universities and public organisations around the country. There are over 200,000 articles to look through, on everything from health, to the life cycle of a bee, to articles about Mongolian literature.
This is a great recourse to broaden your Norwegian vocabulary, find a topic you are interested in or know about already, and wow your Norwegian colleagues with some new words!