Should Students Evaluate Teachers?

I came across another interesting blog article today that asked if students should have a voice in evaluating teachers.  (Click Here to Read the Story).  The article brought up some interesting points, although it is somewhat problematic.  For one, it said that students as the consumers should be able to offer their opinion.  It also talked about how "easy" teachers would get the best ratings, and how that's not necessarily true.  It made the comparison about "easy" teachers and "easy" teenage girls.  On the surface, students say they like them and they're cool, but deep down, no one really respects them.  The author believed the real truth would come out in the evaluations.  It also dealt with some admitted flaws.  For one, how do you have elementary students evaluate their teacher?  Also, how much should the studnets' opinions weigh on the total evaluation? 

So what does everyone think?  Should students have a say in evaluating teachers?