Whether you're deciding between French teachers or you just want to vent about last semester's lousy history lecturer, Rate My Professors is the place to go. Students can anonymously grade profs on everything from how difficult they are to the clarity of their lectures — and now teachers can add rebuttals of their own. Long since out of school? Then you might get some use out of RateMDs, a similar site that grades medical doctors. Launched in 2007, RateMDs already has more than 500,000 ratings of about 150,000 physicians. Like all reviews, these should be taken with a grain of salt, but both sites give you some good inside information on the professionals who matter most in your life.
—Anita Hamilton