Sorry for the late notice, I've been away. 
In the latest episode of the BBC Radio series, Great Lives, Brian Cox chooses Carl Sagan as his subject. The programme is downloadable as a podcast for those outside the UK for the next couple of days (it will also be on BBC iplayer for those in the UK).
I haven't had a chance to listen yet myself, but the programme is usually interesting. From the write-up:
In the latest episode of the BBC Radio series, Great Lives, Brian Cox chooses Carl Sagan as his subject. The programme is downloadable as a podcast for those outside the UK for the next couple of days (it will also be on BBC iplayer for those in the UK).
I haven't had a chance to listen yet myself, but the programme is usually interesting. From the write-up:
Physicist Brian Cox tells Matthew Parris how Carl Sagan's Cosmos tv show changed his life. As a young boy of 13, Brian Cox stared at his television screen every Wednesday evening, as Carl Sagan took him on a journey across the Cosmos. The programme was a ground-breaking piece of television by a brilliant young scientist who could be inspiring and infuriating in equal measure. Sagan was a complex character. Driven to succeed, he came from a relatively poor background to become a millionaire, and one of the most influential scientists of his era. His popularity left him open to both criticism and jealousy amongst his colleagues, and whilst he was passionate about the need to educate the populace, he could also be arrogant and dismissive of his fellow scientists. So just how good a scientist was he, and what is his legacy?