Does the USB port provide power in sleep mode?

Subject pretty much says it all... curious as to if the USB port will continue to provide power to a connected device even in sleep mode?
I can find some info on the G5 iMacs that say they did not, but can't find anything on the Intel iMacs.
Specifically, thinking of buying an iPod Nano and wondering if it will charge it while sleeping.

Regarding Apple's document, it is interesting to note:
Your computer goes to sleep
Your computer can only charge iPod when it's turned on and not asleep. Make sure your computer on and is not set to go to sleep when you want to charge iPod.
Tip: Some Macintosh computers can charge iPod even though they're asleep. If your sleeping computer doesn't charge iPod, don't worry, just wake it and let iPod charge.
Apple doesn't specifiy which computers are capable of this however so I wouldn't bet on it.
Of note, the USB port must provide a very small amount of power not only, I would think, to allow the keyboard/mouse to wake the Mac but also to light the LEDs of my bus powered (not AC powered) Macally hub which remain constant as long the Mac is on (sleeping or not). That also applies to the USB charger that came with my Kensington Wireless keyboard (although I have not tried charging while in sleep mode). That being said, the power - no doubt - is minimal.

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