Seth Lewis has asked me to speak to his class a few times and interviewed me for his dissertation. I am always happy to do stuff like that. What I say is that “I am as open and available as humanly possible.”
That said – I will occasionally ask for favors back. When Seth presented the result of his dissertation at the International Symposium in Austin I was blown away. Partly because it felt as though he was reading my mind (particularly from slide #6 and on). So I asked Seth for his slides. He one-upped me by adding audio to it – so I don’t have to describe a thing. Awesome. Also see his blog post.