If you've got more than one or two devices sitting around, you may find that you start running short of plugs. You can attach them to a computer, but they won't charge very fast that way. The Photive 5-port desktop charger seems like a good way to fix that, and it's on sale for $12 if you use a coupon code at checkout.
The device's usual sale price is $19.95, so to get it down to $12 you need coupon code 8OFF25WA. The Photive charger includes prime shipping, so you could have five extra USB charging ports for a good price. The device lists specific devices next to each port, which is odd. What it means is they put out different currents. The "iPad" ports are 2.1A, the "Samsung Tab" is 1.3A, and the iPhone/Android ones are 1A.
Keep in mind this isn't a hub for data—these are charging ports only. You plug it into the wall, not a computer.