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There are compatible USB wifi modules, like this one: http://www.adafruit.com/products/814

Hmm, that one says it might need a hub too. I have a similar one, if not that one, and the Pi was freezy without a hub, when using the adapter.

I've used both of these without a hub without any problem. I use an old Samsung cell charger (I think 700ma). I don't generally have anything else drawing power from the USB port though.

http://www.amazon.com/gp/product/B0037G2BMY/

http://www.amazon.com/gp/product/B004LPY204/

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