Big numbers. Very big numbers. Open courseware has been wonderful for MIT and wonderful for learners around the world. The costs of infrastructure to support this may be high but the payoffs seem more than worth it.
I am a professional learner, employed as a Full Professor and Associate Dean, Learning & Assessment, at Athabasca University, where I research lots of things broadly in the area of learning and technology, and I teach mainly in the School of Computing & Information Systems. I am a proud Canadian, though I was born in the UK. I am married, with two grown-up children, and two growing-up grandchildren. We all live in beautiful Vancouver.