I found some really useful interactive documentation here:
http://www.dre.vanderbilt.edu/Doxygen/Current/html/ace/
It's Doxygen driven and completely interactive, if you need a good way to look up information on a specific class, method, etc. I also ran across a useful tutorial at:
http://www.huihoo.org/ace_tao/ACE-5....01/page01.html
Finally, the blue ACE book, “The Ace Programmer’s Guide� by Stephen D. Huston et al. 2004, ISBN 0-201-69971-0 is the best overall book I've used to get started.
Not that I know what I'm doing, but at least I can look busy... :cheesy:
--Erica