The title of this website is “Was the election stolen? Here are the facts, you decide.” Though, it may be argued that the url is suggestive of an answer. =)
http://www.solarbus.org/stealyourelection/
Blackbox voting maintains that there definitely was fraud, and are attempting to ascertain the scale of it with hard data.
And a site promoting a book discussing the modern tenor of public debate.
http://www.newsisfree.com/iclick/i,59738707,5879,f/