Roy Spencer blogs about Svensmark's cosmic ray theory of climate change:
While I have been skeptical of Svensmark’s cosmic ray theory up until now, it looks like the evidence is becoming too strong for me to ignore. The following results will surely be controversial, and the reader should remember that what follows is not peer reviewed, and is only a preliminary estimate.
(H/T Chris, by email)
The Institute of Physics looks at Svensmark's work here.