Brian Barrett writing for Wired about charging your phone by connecting to wifi:

The system comprises just two components; an access point (a router), and custom-built sensors. “The goal of the sensors is to harvest RF (radio frequency) power and convert it into DC power,” explains Vamsi Talla, a researcher on the project. “The second piece, the access point, there we actually developed a custom solution on it, just a software modification that would enable the access point to act both as a good power delivery source and, simultaneously, also as a good Wi-Fi router.” In other words, it achieves power over Wi-Fi in a way that both works with pre-existing hardware, and doesn’t interfere with your Internet connection one bit.

Lots of unknowns here, but a future where we wirelessly charge our mobile devices is coming, and not necessarily contained to charging surfaces either.