Dr Roy Spencer’s site, which gives a good oversight with some lay and expert comments.
Anthony Watts blog (Watts Up With That), one of the first and most prominent sites. Has a very comprehensive set of articles and links, including many to other sites of varying complexions.
Judith Curry’s site - some excellent analysis of climate change issues
Not A Lot Of People Know That
Global Warming Policy Foundation - Topical issues and some good essays
Some Cambridge University research.
Somewhat off-topic - YouTube video of Sunday Politics item on diesel particulates
Link to an excellent book, Chill, written by environmentalist Peter Taylor.
Climate: The Counter Consensus
The Deliberate Corruption of Climate Science
Link to a site that produces alternative reports to the IPCC.
An interview with Judith Curry
Professor Bob Carter - The Faux 97% Consensus
Prof.Richard Lindzen - Requires some science knowledge in parts
The WHO Exaggerates future global warming mortality
Extreme Weather Events & Global Warming -
How Good Is The Evidence?
A new case study on Groupthink - long (120+p) but worth a read if you have the time
A short essence of the above (5 pages)
The link to some satellite CO2 data
A long, but interesting and informative, paper on why scientists disagree