Greenpeace: Science Update
http://www.greenpeace.org/raw/content/international/press/reports/racing-over-the-edge.pdf  

Greenpeace: Initial IPCC AR4 Release

http://www.greenpeace.org/raw/content/international/press/reports/ipcc-ar4-briefing.pdf  

PEW Center: Climate Science 101

http://www.pewclimate.org/docUploads/Climate101-Science-Jan09.pdf 

Pew Center: IPCC AR4 Update

http://www.pewclimate.org/docUploads/Key-Scientific-Developments-Since-IPCC-4th-Assessment.pdf 

Climate Safety Report

http://climatesafety.org/wp-content/uploads/climatesafety.pdf