If you have a digital SLR and don’t want to blow two grand on an underwater housing, check out the alternative the folks at Digital Camera World came up with. Just put your camera into a clean fish tank, attach a remote shutter release cable, lower the tank into the water, and fire away. Naturally, this only works in calm water, so don’t take it into the ocean unless you fancy buying a new camera. Details and a photo after the link.
News: Digital Photography Review (dpreview.com)