Plug-in for Locale (which is not free) to detect whether the power source is USB or other (AC/car charger/dock). Can't distinguish between non-USB sources, but you can use other plugins to detect docks.
Needs Android 2.0+ & Locale which isn't free.
v3 fixes HTC app list crash.
Apparently fails on Motorola Droid but I don't have one to test. :-(
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