Two interesting articles on Google from the Washington Post point to the same thing: if Google seems to be offering you plenty of hits but few useful answers, content farms may be to blame. Google says it's trying to avoid this pitfall.
Michael Rosenwald uses an anecdote to show how Twitter got real, useful answers for a friend, while a Google search resulted in a list of unhelpful links. Story here.
Rob Pegoraro explains "content farms" here.
UPDATE 2/17: Chrome extension feature may help! Read more here. Note to self: download Chrome at new workplace.