Have you guys seen this video from vega science? I was going to post the link some time ago and then forgot about it. Or I hope I haven't already posted it somewhere. It's not too long (about a 1/2 hour) but touches on many issues. You might need an updated version of realplayer to play it tho. Just hit the play button when you open the link.

http://www.vega.org.uk/video/programme/15