USB power supply for charging

I've been asked to add 2 USB power outputs to a product to allow
ipods, phones, cameras etc to be charged.

Sounds easy. USB specs 5V, 500mA max per output. So the obvious
solution is a 5V 1A regulator driving 2 USB connectors in parallel.

But is it that easy? Do USB peripherals need to talk to the power
supply? Do the outputs need to be independant:? What else don't I
know? I'm getting concerned about the unknown unknowns.

Any useful thoughts welcome.
.

Relevant Pages

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