While the website is neither particularly slick nor incredibly user friendly, there is a nice bit of detail available if you poke around. You can see how a given doctor rates in a number of specified areas, how that compares to the average care available and even compare up to four doctors at once. It's pretty useful stuff if you're trying to figure out if your doctor is as bad as you think -- or if you're just a whiny little brat. Of course, it would all be even more useful if you could actually afford to see a doctor...
Check it out at www.checkbook.org/patientcentral/ .