Reddit reviews Pimsleur Norwegian Level 1 CD: Learn to Speak and Understand Norwegian with Pimsleur Language Programs (1) (Comprehensive)

There's some good news, and bad news.

The good news is that there is an effective language learning system out there. Pimsleur. It's pretty much the best you can get to learn any language.

The bad news is Simon & Schuster, who publish language courses based on the Pimsleur method, don't have a complete set of Norwegian courses yet. They only have level one, out of three total levels. I also think it is prohibitively expensive, but you can torrent it.

As background information, avoid Rosetta Stone. Read How to Remember Everything you Ever Learn (praphrased title) on Wired. Note the part "The most popular learning systems sold today — for instance, foreign language software like Rosetta Stone — cheerfully defy every one of the psychologists' warnings."

This site also has good background information on learning languages, in general.

You must remember that learning to understand and speak a language is an entirely different skill from reading and writing it. You must keep them separate, for the benefit of each. Therefore, avoid any language learning that involves written text. Your brain is so highly developed, that it will automatically assign your native phonemes to the foreign text, making your accent terrible. Use an audio course.