Yeah, ATK really isn't your friend unless you really understand the OS...and even then it's only a moderately useful friend. Sadly I ponied up for the paid version before I realized that.
As a mini guide to battery life issues:
1) Be sure to charge for a decent time past 100%
2) Switch screen brightness from auto to manual and then drop it to 20% unless ambient lighting demands otherwise.
3) Make sure you don't have too many widgets that are pulling data in real time (RSS feeds, weather widgets, all social networking widgets, etc). The ones you do have, make sure they are updating at a reasonable time, not all the time.
4) Don't use anything with the "Pure" brand name from the market (they're great widgets, but they seem to personally track down and murder battery life on the DX).
To do things like control brightness easily, or shut off your GPS manually if it's being run for some reason when it's not needed, get Power Control Widget from the marketplace (it's free) and gives you a bar that is configurable with lots of cool stuff beyond the stock Moto ones (like an adjustment slider for screen brightness).
If you still want to do a little more, download the free version of Juice Defender, turn off your wireless before you do the install, when it installs just accept the defaults and don't bother touching the really poor UI that lets you meddle with things. Just as a default it will automatically switch off 3G data when you are on wifi, which will save you a ton of juice if you spend a lot of your day with a wireless network (like I do).
That's about it for the quick and easy stuff that I can think of.