As much as choice is a good thing, I don't think that the default should change from being Google. Mozilla gets a huge amount of money from Google for directing searches there. The money they make by doing this lets this great open source browser keep making headway.

http://www.techcrunch.com/2007/10/23/google-continues-to-ban...

If you want a default search other than Google, you can certainly change it. Just a quick trip to about:config.

http://www.firefoxfacts.com/2008/01/13/change-default-search...