The battery left widget is absolutely awesome IMHO. It calibrates to your battery so it will give accurate readings. I know it's not a percentage up in the battery icon and it's a widget but it works really really well.
Circle battery widget. Does not need calibrating, works for most phones/roms, and it reads the battery level from a system file. Plus it is customizable as well.
Droid Junk has posted some mods at MyDroidForums. My screenschot shows my 1% battery, black status bar and notification toggles that his tools provide.
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