After reading Gary MacDonald's fascinating article about Otocinclus-keeping in the February issue of Tropical Fish Hobbyist, I joined the TropicalResources bulletin board. And there I came across links to a fascinating set of fish videos on YouTube posted by Ivan Mikolji, who posts under the username fishfromvenezuela. He has an amazing set of videos, and really cool pictures on his website.
Here's one of his many videos. I really like the fact that you can get a feel for the species in its natural habitat. It would definitely be an asset to anyone setting up a South American biotope tank.