You also have to be pretty confident about your teaching ability to put that stuff up on the internet for everyone to see. I'd like to put some of my lectures

You also have to be pretty confident about your teaching ability to put that stuff up on the internet for everyone to see. I'd like to put some of my lectures online in a year or two, but currently they don't meet the Khan standard. Regarding research professors, the chair of the department I was a graduate student at once said that your teaching can only hurt your career; it can never help it.