National Geographic Magazine - WildCam AFRICA
This, to be sure is amazing! See an African Lake in realtime with all sorts of wildlife coming to drink. Uses RealAudio and so has all the sounds as well as views as they happen.
:UPDATE Nothing lasts forever and this site went off the net Dec. 18, 2005 Clips from it are still available but the live feed is no more. :(
:2nd UPDATE The link above is updated to what is representing a more current Wildcam page by National Geographic.