The link to the answer on why tab order doesn't work in preview links to http://forums.adobe.com/index.jspa.
I would like to see an FAQ on creating and managing subforms as it seems to be a topic that comes up again and again.
A guide to the accessibility features of LCD would be good too as most accessibility guidance is geared toward AcroForm users.
Lori Kassuba is an AUC Expert and Community Manager for AcrobatUsers.com.