The university of Bern has made public as podcasts the lectures given by Nobel prize winner Andre Geim in 2012 as part of the university’s annual ‘Einstein Lectures’.
Two of the three lectures concern graphene: Random Walk to Graphene and Magic of Flat Carbon. The third lecture The Science of Flying Frogs is somewhat different, and concerns the work for which Prof. Geim was awarded the satirical Ig-Nobel prize in 2000. (Apparently Prof. Geim is the only person to have been awarded both a Nobel prize and an Ig-Nobel prize).
To view these lectures, see http://www.einsteinlectures.unibe.ch/fruehere_vortraege/2012_andre_geim/index_ger.html