Basically, without net neutrality comcast for example, could charge yahoo to get faster speeds than google to encourage users to go to yahoo instead of google.
Was gonna post the savetheinternet link but barnes beat me to it..
Funny quote from Ted Stevens, the chairman of the commerce(as well as science/transportation) commitee, who is the one trying to kill net neutrality:
"The internet is a series of tubes"- Ted Stevens
http://www.youtube.com/watch?v=8rZEi70UyJs
At the moment, with net neutrality in place, ISP's "MUST" deliver there users to sites at the maximum capable speed, which relies on the sites bandwidth / the users bandwidth. So currently, there is no middleman, there is just the user and the website/servers.
In the future if Stevens gets his way, small sites would get put in the slow lane, if they can't pay up for the faster access even after they pay for there faster connection / servers.
"William L. Smith, chief technology officer for Atlanta-based BellSouth Corp., told reporters and analysts that an Internet service provider such as his firm should be able, for example, to charge Yahoo Inc. for the opportunity to have its search site load faster than that of Google Inc."