Today was my first full work day without ATK installed, and my battery life was much better. Phone came off the charger at 7:30AM. I had a day of heavy use (heavy texting, e-mails, one call, 1+ hour of music, Facebook, browsing, camera, installing apps) and about an hour or two after I got home, I checked my battery status to find it was at 50% at 6:30 or so, which is the best I've gotten out of the Droid yet.
So I can definitely vouch for the fact that ATK does not help in the slightest bit. Google knows what they're doing; have faith in their software engineers. Let Android do its thing and quit wasting your time with these apps.