Yay! I found a wireless adapter that the Raspberry Pi is able to power without an external hub. It’s a Belkin N150 Micro Wireless USB Adapter. Not sure of the range, but it works well enough, and is cheap.
Just to show you how hard-core I am, that’s a screenshot of a browser (showing a picture of the Raspberry Pi + LSTech Solar charger) running on that Raspberry Pi with an X session tunnelled to the laptop you can see in the background. My head hurts now.