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Ok. I guess I need to calm down a bit. Sorry.
But, holy s#!t this whole task killing thing drives me mad.

Which is pointless as you can do this from settings>applications>manage applications - so why install another app to do something you can already do.
@ widehead - some people just do not believe. Leave them to it I say.
With app killers - it frees up more stuff
Frees up what? RAM? Free RAM in Android is useless. You are showing a basic misunderstanding of how Android works. FULL RAM is a good thing in Android! It means more apps are stored in memory, ready to be opened up when you need them, with less drain on your battery. If RAM is required Android will kill apps itself - this is what it is designed to do.
Task killers interfere with Android app management. They clog up the system and drain your battery.
if you have a task killer installed, you do not understand how Android works.
It really is as simple as that.
Widehead, not sure why you think a comparison with an E71 would remove credibility?
Symbian is one of the most successful phone platforms ever, and the E71 was a top notch phone, with a good battery life.
Considering the extra power the Desire has, for it to last as long as the E71 is not bad going.
Performance wise, the phone felt no different at all. However, I do admit it felt more stable.
Well, I've looked at my battery stats for yesterday whilst not running Advanced TaskKiller, and compared to the day before when I was. In terms of battery life, there really isn't much in it. See for yourselves:
I'm perhaps converted......

This is quite interesting, although I would do it a few days to make it completely fair (I find with mine that sometimes the battery lasts longer on some days than others for no specific reason that I can work out).

Apologies if I overeacted before, makes me laugh re-reading it!
Anyway I uninstalled ATK about a week ago and have actually noticed no difference in battery life compared to before. may go down the "master reset" route as I cant get 24hours use out of my battery, probably got too much junk in there!
Are you a light user? I'm not an overly heavy user but I expect to charge mine every night. Whether you have ATK or not...it's not going to make much of a difference to your battery life either way.
I would probably class myself as a medium user, the odd phonecall & text, plenty of internet (rarely via wifi though), gaming & music. The battery drain could be me not used to a phone like this (came from a SE W980) so I was used to 4-5 days without charging before!
I may have a couple of rogue apps in there somewhere, perhaps a clean out as opposed to a complete reset maybe in order.