I made these four podcasts on some of the corals of Great Barrier Reef for my Geoperspectives: Australia course last year. Don't laugh!
You all might enjoy them, or think I'm crazy.
Either way, here they are:
Corals of the GBR (Episode 1: Intro)
http://geoaustralia.podomatic.com/entry/2010-11-27T17_28_15-08_00
Episode 2: SPS
http://geoaustralia.podomatic.com/entry/2010-12-01T12_50_49-08_00
Episode 3: LPS
http://geoaustralia.podomatic.com/entry/2010-12-01T20_32_36-08_00
Episode 4: Soft Corals
http://geoaustralia.podomatic.com/entry/2010-12-02T12_18_27-08_00