Stacy Millions built her his (sorry!) mintyboost to match up with a OpenMoko Neo phone. By default, the phone uses the ‘correct’ 100mA drain current to charge when there is no USB enumeration. However, it is possible to force the phone into using a 500mA charging current via software. So she he wrote a little app that will hypercharge!
This is pretty cool: if you have a typical phone, there is no way to poke & hack the hardware at these levels