Site Map vs Site Index

http://www.aussi.org/indexer.htm
http://www.asindexing.org/site/backndx.htm
http://www.sun.com/siteindex/
http://my.webmd.com/medical_information/condition_centers/default.htm
http://www.adobe.com/products/main.html
http://www.amazon.com/exec/obidos/subst/home/all-stores.html/104-3468701-819
5133
http://www.amazon.com/exec/obidos/tg/browse/-/508510/104-3468701-8195133