@cbell:
A help page like this one:
http://www.booksonboard.com/index.php?F=help
for all the different reading widgets would help, especially if you're trying to cross-market the ereaders sold at DA Direct (especially your featured ECOreader) with Read Without Paper.
I didn't find your current help files very useful at all, I'm afraid. Pictures and screen grabs walkthroughs are good; I couldn't see any references to acsm links in your section at all.