I had the pleasure of being one of Olin's undergraduate students in his also infamous compilers course. We even worked together on a paper for a Scheme conference back in 2004. Anyways, one of the things I will always remember him say to a group of students: "There are no stupid questions, only stupid students." And he always started a class with a story about his college days. Great guy.
Yup- I took compilers with him in 2005 and while it was one of the hardest courses I took, it definitely set the tone for what I wanted to work on. I was really sad when he left Georgia Tech- he was definitely one of the best professors I had there.
Took Fundies a few semesters back and looking to take compilers with him next spring (they cancelled it this semester). Agree with what was said so far.