Dry Fly Media's Rivers In Motion series captures the hallmark sights and sounds of some of the most famous rivers in the world. LINK
They are also One Percent for the Planet members.
UPDATE: Dry Fly Media has extended a great offer to the Moldy Chum family. During Q109, Rivers in Motion will be on sale offering Moldy Chum readers 50% off. Use "moldychum" in lowercase when prompted for the order code. Order Here