I've spent a fair bit of time learning about leather care. And I honestly think this is the best stuff available (and why):
http://velo-orange.blogspot.com/
But some might say I'm biased ;-)
Chris Kulczycki Velo Orange, LLC 1819 George Avenue Annapolis, MD 21401 USA
P, 443-949-8115 F, 443-926-0095
http://www.velo-orange.com/
http://velo-orange.blogspot.com/
http://voimports.com/