Yes, the beautiful do get better student evaluations, the research of Daniel Hamermesh confirms this, the link is through Instapundit.
And get this bit, taken from the link within the link:
According to their data, the effect of beauty (or lack thereof) on teaching evaluations for men was three times as great as it was for women.
How about this?:
A glance at Web sites such as ProfessorPerformance.com and RateMyProfessors.com — where students rate their instructors on criteria such as coolness, clarity, easiness, helpfulness, and hotness (on RateMyProfessors.com, hot professors get chili peppers beside their names) — leaves little doubt about the viciousness of some students. Petty comments abound: “Someone fire this fat bastard” and “Looks like a hobbit, is not a nice person!”
Harold Glasser has been a victim of such comments. One of his students posted the following remarks on ProfessorPerformance.com: “Glasser where’s (sic) the same blue fleece sweatercoat thing, and this awful matching blue fleece hat that looks like the one Elmer Fudd wore. If this wasn’t enough, he has some of the same mannerisms as Dr. Evil,” from the Austin Powers movies.
There is no chili pepper next to my name, but given all this, my opinion of my looks has gone up.
Addendum: Here is link to the paper, thanks to John Charles for the pointer.