Arbortext folks are by nature a chatty and helpful bunch. This list is constantly evolving. Where do you go? (Have you taken the poll?)
Our favorites, in no particular order....
Mailing list hosted by PTC/User
The PTC/User portal (http://www.ptcuser.org) hosts the long-running Adepters mailing list. This list started in 1996 and has always been monitored by the PTC/Arbortext software engineering staff. Many long-time users and tools folks also regularly monitor the list. If you have a question, it's a really good resource as questions generally get answered within 24 hours. Beginning and advanced questions encouraged.
Many Arbortext users regularly search it for help with difficult to solve issues. The archive was started by Karl Johan Kleist. In 2008, Karl changed career paths, and Liz Fraley at Single-Sourcing Solutions has been maintaining it ever since.
The archive has Arbortext, IsoDraw and (soon) APP code, macros, and solutions to common problems.
Advanced Print Publisher Mailing List hosted by Yahoo Groups
3b2users is a list for users of Arbortext Advanced Print Publisher, formerly called Advent 3B2, for the exchange of information, hints and tips.
Tutorial in the Help Center
After launching Arbortext Editor, go to the Help menu and launch the Help Center. The first item under Authoring is an Arbortext Editor Tutorial. This is a great place to start learning or to pick up some tips and shortcuts to what you do every day.
SF Bay Arbortext PTC/User Group
The SF Bay Arbortext PTC/User Group hosts monthly Live Meetings showcasing interesting implementation issues around the Arbortext community.
Most Arbortext knowledge is tribal in nature. The PubWright podcast interviews Arbortext implementers, customers, and experts in an attempt to share that knowledge with the greater Arbortext community.
This is a podcast series available here and on iTunes here.
Introduction to DITA: A User Guide to the Darwin Information Typing Architecture Arbortext Edition - JoAnn Hackos
While we're talking DITA.... Although this is not an online resource, this is Arbortext-specific. Procedures and Examples in this book use Arbortext Editor. The book can be ordered from ComTech Services here.
You'd be surprised at how many there are. Presentations about, by, and for, Arbortext users. Search: Arbortext