If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.
The manuals are for sale from the Contax Distributors. They will cost about 10$US or â‚¬ and about Â£6.00 Sterling. Well worth it, but as Jerzy says it is mostly intuitive. If you want the custom functions pages I will dig out my manual and scan them for you. Are you on 56k or broadband?