I go to ustream.tv and it is super easy to get it set up. I plug in the webcam, train it so it's where I want to be. I set up my ustream account. Once I have an account, i click on the "go live" button at the top right of the screen. Make sure the image is what I want on the popup, and then hit the "start broadcast" button. I always mute the sound, but that's a personal preference.
So, you need:
1- something to film
2- computer with internet connection
4- light to light up said object to film.
It's really simple, trust me!
(and my webcam is live if you want to check it out)