"Why the hell is Chrome uploading and downloading so much data?"

* looks through open tabs *

"Oh."

Though most people would never notice, I feel like with developers (the folks who will implement this on their sites) you may have a tough time convincing them this is safe and ethical. I suggest being up front about this issue and suggesting disclosure/consent strategies to any of your customers (and perhaps doing research and surveys to prove that nobody really minds this use of their bandwidth).

Also, it's kinda weird that you've appropriated the HTML 5 logo into your own. That's probably within the logo's Creative Commons license, but I don't see where you've given attribution as required by said license.

Slick page though, and a good informative site... I don't mean to be a downer. Good luck!