Australian computer scientist Tim Lambert is one of the more underrated bloggers I know of. He does a lot of fairly technical work, chasing down statistical mistakes made by sloppy or devious right-wing hack scientists. One of the neatest cases was when he caught some global warming deniers plugging in angle measurements in degrees when their software demanded radians, thereby rendering enormous amounts of their data invalid. It's about a year old, but it's still a neat story to look at if you didn't see it when it came out.
The more amusing story is about how he helped to catch gun control opponent John Lott using "Mary Rosh" and other pseudonyms to promote his fraudulent work over the internet.
