ACS Administrator's Guide

ACS Documentation : ACS Administrator's Guide

Philip's Webmaster Guide: for the person who makes publishing decisions
Magic Files
Filters and Other Tricks
Database Pools
Directories
Obtaining and Installing APM Packages [ACS4]
Monitoring
Server Clustering: a facility for keeping state synchronized between a group of load-balanced servers
Redirects: ensuring that legacy URLs pointed to by bookmarks and search engines still work
Robot detection: making sure that your entire site gets indexed
Customer relationship management: tracking a customer relationship through its various states.
Member value: a way of accumulating charges for users and then billing them out at the end of each month (commercial sites) or excluding them from the community if the charges get too high (non-commercial)