Thanks for the responses and the link (I was just browsing around the CNIB [cnib.ca] website). But I think I probably wasn't explicit enough.
We've been building accessible sites here for a number of years already. We're quite well-versed in doing this job on the web, but obviously the web is fundamentally different in that the content can be extensively altered by either the user or the user-agent according to the users' needs.
In print, on the other hand, it's not an option to produce multiple versions of a document, and whatever version does get produced is not really changeable.
The principles of good design and typography I referred to earlier--for example using readable fonts at appropriate sizes, proper leading and kerning, suitable degrees of contrast between type and ground and in logos--are obviously the foundation to anything we can do for accessibility in print, but there is little information we've managed to find that's directed specifically towards designing in print for accessibility.
It's information beyond the basics of good design and type design that we're interested in. Anybody know of any resources like that?