Just thought I’d share a useful monolingual dictionary for Norwegian: http://bit.ly/H7ACOH
This is obviously not useful for translation, but comes in useful if you come across an irregular conjugation of a verb and can’t figure out what the infinitive would be in order to look it up in a dictionary.
Type the conjugated form into the above dict and you should be able to find out the infinitive form.
I should also note that they do have dictionaries on that site translating from Bokmål to a variety of languages apart from English, though they do have a Nynorsk-English dictionary on there. For some reason they removed the Bokmål-English dictionary a while ago.