From P2P Foundation

Internet TV = an open distribution platform, where content can be delivered via this open platform directly to subscribers It is related to User-Generated Content vehicles such as YouTube.

In this context, it is usually distinguished from IP TV, which is seen as a controlled platform for branded content, using IP-streaming technology.

Ken Camp, at [1] proposes the alternative concept of TVoIP

More Information

Wikipedia IPTV entry at http://en.wikipedia.org/wiki/Iptv,

Wikipedia Internet television entry at http://en.wikipedia.org/wiki/Internet_television

See the free and open-source Internet TV platform the Democracy Player from the Participatory Culture Foundation. It allows everyone to watch, make (and distribute) Internet TV.