As part of birding's rapid progress to socially acceptable behaviour amongst folk of a certain age, I can recommend Tim Birkhead's September Do Lecture "The Wisdom of Birds" http://bit.ly/7PJp7P for as informative 20 minutes as you will find anywhere.

Featuring the unfeasibly large testicles of warblers, whistling bullfinches and Etty Darwin's anti-stinkhorn campaign and why all of these things are important, it's the biology lesson that you never had at school and worth a watch even if you hate our feathered friends.