IMO the IPCC reports are very long, boring, and can get too technical at times. I've read large parts of them and wouldn't recommend it.
I'm a fan of
www.realclimate.org, which covers most of the major new developments in the science, but realize it's written by "mainstream" scientists so it doesn't really represent the side of the "skeptics" except to refute them. At times they get too technical too.
Like I mentioned earlier, The Two Mile Time Machine is definitely worth a read. Alley keeps things really simple and has a fun writing style as scientists go. The book also stays very neutral. It's a great intro to paleoclimatology and modeling.
I would NOT recommend
An Inconvenient Truth.
I'll try to come up with a better list tonight, but that's all I can think of right now. I'm visiting the family and don't have anything good saved to my favorites on this computer.