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For what it's worth, I haven't use any task killers, but I did turn off several radios and auto sync. Here's what I did:
Calibrated my battery (instructions in this very helpful thread);
Turned off auto-sync (menu>settings>accounts & sync>Auto-sync);
Turned off GPS; (cell towers are accurate enough for my purpose)
Turned off Wi-Fi; (3G suits my needs)
Turned off Bluetooth; (I don't use any Bluetooth devices)
Turned off 4G; (There's no 4G in my area)
My results from those actions:
Routine 30 hour use from 100% charge to 30% charge.
I manually have to update weather now though, and it will sometimes disappear.