USB 2.0 provides 5 Volts and it starts out at 100mA (milli amps?) and can provide up to 500mA, but there are some exceptions with certain software/hardware it seems, where a device can draw up to 1 Amp. Also, with PlusPower (hell if I know anything about it yet, I just found it on Wikipedia) a device can draw the following:

* +5 volts DC at up to 6 amps per connector (up to 30 watts)
* +12 volts DC at up to 6 amps per connector (up to 72 watts)
* +24 volts DC at up to 6 amps per connector (up to 144 watts)

If that info helps you help me, cool!

[Linked Image from zandadev.com]