The best "newsletter" on climate science, combined with the best list of climate science articles, is one I've been reading weekly since 1997 -- here's the link:

This was a good 
climate science 
reading list
back in 1997.

Ken Haapala made it 
an excellent read,
several years ago
by adding his 
"newsletter" to it:

http://www.sepp.org/the-week-that-was.cfm