Articles on the use of salt in FW aquariums & Osmoregulation:
(This is snipped with a couple of new links from my Disease - Illness posts)
http://www.aquarticles.com/articles/ponds/Kebus_Salt_Treatments.html (GoldLenny)
http://www.skepticalaquarist.com/docs/health/salt.shtml - Salt or NO Salt (GoldLenny)
http://groups.msn.com/FishHealth/osmoregulation.msnw (Hailey)
http://www.fishdoc.co.uk/water/osmoregulation.htm (GoldLenny)
http://www.goldfishinfo.com/salt.htm (GoldLenny)
http://badmanstropicalfish.com/articles/article22.html - The Great Salt Myth (GoldLenny)
http://www.badmanstropicalfish.com/articles/article5.html - To Salt or NOT to Salt (GoldLenny)
http://www.algone.com/salt_in_fresh.php - Salt in Freshwater (GoldLenny)
http://www.algone.com/salinity.htm - Saltwater Salinity & Specific Gravity (GoldLenny)
http://thegab.org/forum/viewtopic.php?t=5427 - TheGab.org (Goldfish & Aquarium Board) forum thread on Calcium and the Osmoregulatory System. (GoldLenny)
http://www.koivet.com/forums/showthread.php?t=15967 - KoiVet.com LONG forum thread on Salt, Chloride and other minerals/chemicals related to Salt & Osmoregulation. (GoldLenny)