The Kindle has long sported a 3G network connection on premium models. Now, with this hack for Kindle 3G Keyboard models, you can tether your computer through that connection.
At this point it’s largely a proof of concept hack as, in addition to it being against the terms of service for your Kindle, it would be pretty obvious that you’re trying to stream YouTube videos through the connection. That said, it’s a neat advancement in the Kindle hacking community and, if paired with low-volume browsing like downloading documents and browsing pages in text-only mode it would simply look like you’re one of the 4 people in the world that actually uses the Kindle’s experimental browser.
Hit up the link below for the full run down on how to enable data-tethering on your Kindle.