Of course, anyone who's been looking into this deeply will have read the following, but not everyone has the time to study the details: Solar activity & climate: is the sun causing global warming?
Sometimes you need something relatively short and snappy, like potholer54's excellent films. Everything he says comes from peer-reviewed scientific journals.
[ame="http://www.youtube.com/watch?v=xvMmPtEt8dc"]YouTube- 8. Climate Change -- Has the Earth been cooling?[/ame]