Live fish view from the Georgia Aquarium. Sharks, mantas and lots of others. The live stream is available until August 7.
I just love underwater webcams. This one is currently running fullscreen on my secondary LCD.
When BP blew up the Macondo well last year I spent hours watching and recording some of the underwater work. Like this Color Volcano, the crab eating a dead eel and the final capping of the dead well.