Making a portable HTC Hero Android phone charger
The design can be identical to the Mintyboost, as it's compatibility list includes the HTC Hero (GSM). Since the Mintyboost can provide up to (at least) 500mA at 5V, the maximum a regular USB 2.0 port is supposed to spit out, any device that fits under the USB 2.0 power spec* can be powered by the Mintyboost. The HTC Hero USB port is designed for HTC's proprietary ExtUSB[WP link] plug, which is backwards-compatible with mini-USB/mini-B, so you can use a standard-A-to-mini-B cable.

I recommend a battery other than the 9V (PP3) to improve all of power, space and cost efficiency. The Mintyboost uses AA's -- they'd be spiffy.

*Not the USB 2.0 power port spec, though, which can provide more than 500mA if so rated.