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Most tablet devices won't charge via USB (or atleast charge well). They need more power than a USB port puts out to charge in a decent amount of time.
I haven't tried the Nook Tab, but with my Transformer and Nook Color I got some charge as long as I didn't try using them while 'charging' that way.
I'm kind of surprised that someone hasn't come out with a dual USB charging cable for any of these devices that draws power from two ports (I had something similar in the early days of portable hard drives).
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