About a month and a half ago I reported on the USBCELL, a set of rechargeable batteries which recharge through the USB ports on your computer. This is quite a convenient way to recharge, especially while traveling. At the time of post, however, the batteries were only available to those living in the UK. But now they are available to all those living in the US as well, at the price of $19.95 a pack.
I recall seeing these in a retail store in the US a couple of weeks ago.