The two biggest challenges for IP broadcasters are marketing and bandwidth. Some places you can get free bandwidth include:
Our Media [http://ourmedia.org/]
Google Video [https://upload.video.google.com/]
These sites require you upload your video to them, but they offer a way for people to find your content. You can reduce bandwidth costs by Coralizing your content. This requires a simple change to your links, and works very well until you start becoming very popular.
If you’re doing hundreds of gigabytes a day you’re probably popular enough to use BitTorrent [http://www.blogtorrent.com/]. I use the Blog Torrent software which is easy to install and use.