Roger Penrose: Before the Big Bang

Professor Sir Roger Penrose (Oxford) will give the second memorial (string theorist) Andrew Chamblin lecture in Cambridge on Friday (June 27th, 2008, 15:00):

Deep questions of cosmology: did something happen before the Big Bang?

I suppose it will be similar to a lecture at George Mason University a year ago:

Before the Big Bang (playlist, 9 times 10 minutes)

If I manage to listen to it, I will write some comments here.