Following last months programme on Open Source[1], BBC Radio 4 seem to 
making a habit of it.
There's another program investigating the Open Source world, including a 
brief interview with FSF founder Richard Stallman.
It appears you can listen again from the BBC website from tomorrow 
onwards. [2]
Regards,
Graeme Hilton
[1] 
http://www.hants.lug.org.uk/lurker/message/20070309.180937.b423d79a.en.html
[2] 
http://www.bbc.co.uk/radio4/factual/ and look for Open Source in the 
list.