You might be interested in a some threads from the FAQ section on "The Norse and the Vikings":

• What happened to the vikings? - 31 comments, over 1 year old.
• This thread gives brief mention to the Christianization of the Norse and then goes on to describe the context in which it and other factors caused the Viking Age to end.
• Why did Christianity win over the Nordic and Germanic religions? - 38 comments, over 1 year old.
• The commenters here go into exactly why the Vikings converted and the general politics surrounding their conversions.