Exploded views for Shimano, Suntour, Campy, and Sturmey Archer. Although this is not a total and complete list. Shimano Europe has exploded views of all their stuff. This is a complete site with more than anyone else I know. I am not knowing if there is more on Campy but it is something none the less.
http://www.ubike.com/reference/shimano/shimdex.htm
http://www.ubike.com/reference/suntour/sundex.htm
http://www.ubike.com/reference/campi/camdex.htm
http://www.ubike.com/reference/SA/aw3sp.htm
More Suntour
http://www.totalbike.com/reference/suntour/