“TVU networks enables anyone broadcast TV programs to global audiences cost effectively. Its service is based on a number of patent-pending technologies, which covers high quality video coding, efficient real-time P2P distribution, and effective digital rights management. TVU netowrks is founded and led by the veterans of digital TV, Internet, software and TV programming.”

My experience:

Having tried almost all free online television programs for my computer, I am most happy with what TVU networks has to offer.  Its an awesome free service, still in beta(2).  A very decent list of channels.
You can even broadcast!

Cons: Visually, it lacks the appearance it should be having at this point of game in online television streaming.  It is not like Joost, with an awesome interface. 

I tried Joost, but uninstalled it because 1) it was a bit complicated, 2) is only version 1.0,  and 3) its very unstable.

Link: http://www.tvunetworks.com/
tadbit.com rating - 8/10