This is a great tip if you're looking to buy Windows Mobile Applications and they offer a free trial period. Install the trial period version of the program and begin running it, then go back to Tip #2 and see if Task Manager v3.1 is showing huge power outputs from the new program. If the application is taking up way to much memory I would suggest testing several other applications that offer the same type of use, if one of them works as well with less power output, then you should go with that application.
Does this step take more work? Of course it does, but the lack of a dead battery half way through the day may be worth the research for some people, I know it is for me.
Also, in my expert opinion, programs that work in the same manner as other programs but take up less CPU usage are usually more competently programmed, and therefore more likely to work in a fluid manner.