i just found the widget for advanced task killer lol
my only thing is, i use google listen, tunewiki with keepscreen. if i forget and leave these running...android does not kill them. the battery dies before then do!
keepscreen makes it so that the screen stays on for whatever app u specify. i need that so when im using google maps it doesnt go to sleep. or when im using tunewiki while driving the screen stays up so i can change music.
its MY preference. so if i get a call and forget to close those apps (which by the way do not have dedicated end or close options) i have to use taskmanager or they will drain my battery. so for me it works, i am past the point of debating it.
so, do whatever works best for your applications.