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Noobie question:

If I want to have a standalone board with an arduino chip/ oscillator, can I just use USB power directly with the right connector (USB +5V directly to Arduino Vcc)?

That is, is USB power regulated (from the computer, or one of those AC/USB wall adapters), so a separate voltage regulator would not be required on board?

Thanks!
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Yes. I've used an AC wall adapter and it's an easy way to get it working. If you use power from a USB port on a computer there is a limit to how much power you can draw.
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Quote
If I want to have a standalone board with an arduino chip/ oscillator, can I just use USB power directly with the right connector (USB +5V directly to Arduino Vcc)?

Yes.  However, you may want to put a powered USB HUB in the middle to provide some protection for the host computer.  This has the added benefit of powering your project when the computer is off or disconnected.
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Ok thanks to both of you - I will try as a starter just running the USB 5v directly to the Arduino Vcc pin (this would not be an UNO board, or whatever).

This seems like a simple, inexpensive, and safe (though current limited) method of powering a custom board.

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