This book contains useful information about how observe with the ATA and reduce the data that it produces.
The ATA user mailing list archives (available to subscribers only; subscribe here) also contain useful information about techniques for observing with the array and reducing data. The "MMM" list is home to discussion about reducing data with MIRIAD with an emphasis on the ATA. Its archives don't appear to be online but you can subscribe here.
You can check the list of known issues to make sure you're on top of what's going on with the system. You can add new tickets or add comments to existing tickets.
Peter has uploaded several instructional videos in Windows Media format. Mac users may have difficulty viewing these unless they install software such as Flip4Mac. Once this software is downloaded and installed, restart your browser and try to play the videos again.
You can see the full table of contents for this book as well as the list of toplevel sections below.