interactive stuff:
------------------
http://pavei.cappelen.no/
http://www.sofn.com/norwegian_culture/languagelessons_index.jsp
http://www.statvoks.no/konsept/norsk2/

courses and other info:
-----------------------
http://www.velkommenoslo.no/english/norwegian/other.htm
http://www.amazon.com/Colloquial-Norwegian-Complete-Language-Multimedia/dp/0415110114