digideep.com :: list of all underwater housings suitable for digital photography and videography...
complete review of underwater housings, strobes and arms for digital cameras...
http://www.digideep.com/
Google PR:5

Sea & Sea USA - Underwater Photography Cameras & Video
Sea and Sea bridges the centuries with a comprehensive line of underwater imaging products, from the world's most popular amphibious cameras to cutting edge housings for SLR cameras and video camcorders, sterling lenses and strobes, and an extensive array of accessories.
http://www.seaandsea.com/
Google PR:5

Subal Foto Unterwassergehäuse für digitale und analoge Kameras - Unterwasserfotografie mit Subal
http://www.subal.de/
Google PR:4

AG-AQUA.DE Die ganze Welt der Unterwasser Fotografie
http://www.ag-aqua.de/
Google PR:3