I usually enjoy the NZ Royal Society Lectures. This year we have had the Galileo Lectures to mark the International Year of Astronomy.
Here are the description of the six lectures, together with links to download the podcasts. Taken from: Radio New Zealand National : Lectures & Forums : The Galileo Lectures.
The Galileo Lecture series is produced by Radio New Zealand National in partnership with the Royal Society of New Zealand. It celebrates the 2009 International Year of Astronomy, marking 400 years since Galileo used a telescope to view the solar system and transformed our understanding of Earth’s place in the Universe.