There are a bunch of good amateur astronomers on FR- Joe is one of them.
I have an ETX-90, I just moved cross country and haven't had a place to really play with it yet. Maybe very soon though.
I see that the DS-90AT has Autostar. The scope, generally speaking needs two things: polar alignment (Meade's documentation is usually pretty good at explaining this), and it needs to know where a couple of easy to find objects are. Also, it'll ask you the time, date, and latitude/longitude. Then the onboard computer will be able to find and track pretty much everything else.
Thanks!! And y'all keep the lessons coming. We want all the info we can get.