The Slingbox is a box that attaches to your home TV that allows you to send whatever's showing to a remote device. Soon, these boxes will be sending their video to your mobile phone–that is, if wireless providers don't block it.
Forbes has an article on Sling Media's plight to be supported by wireless carriers.
According to the article, it's not so much that the network doesn't have the bandwidth or speed to support Sling's product, it's that the carriers have competing services. Sounds like a problem of net neutrality to me.
How tech supports good policy