If you're just streaming from somewhere in your house to your TV, AirPlay is probably the simplest way to do this. If you need to stream remotely, Qik allows you to record and stream video realtime to their servers and the video can be viewed live ina browser. I think Ustream is a similar service as well.
It's also useful if you ever find yourself in the unfortunate position of needing to record police misbehavior, since it streams in real time, if your phone is taken/destroyed you will still have all the video saved online.
I haven't used either service though.