You may wish to check out Zymöl leather care products …
http://www.zymol.com/leather.htm
Zymöl ‘Treat’ is excellent … I’ve been using this stuff for a while and my black leather interior still looks brand new.
http://www.zymol.com/treat2.htm
Also, Spinneybeck and Connolly offer some great leather care products. Try to avoid Lexol or leather care products from Nappa … your leather will become sticky over time (in my experience)
http://www.spinneybeck.com/main.cfm?vPage=About
http://www.motorcarsltd.com/gifts/connolly.htm
John