iPad: How to Stream Video to an iPad

You have your files stored somewhere on your local network. On a Mac, a PC, an external USB drive, a Network Attached Storage device etc.... Now you're enjoying a lazy Saturday morning. Your newspaper and your iPad spread out on your kitchen table.The idea that you now want to check out -say- the latest episode of 'The Big Bang Theory' does not sound too crazy!But how to do it? How to stream movies from your network or from your computer to your iPad?Surprisingly this seems not such an easy problem to solve. I originally thought in iOS 4.2 one could do it using 'AirPlay' but I think I was wrong.The first resources I found to answer the questions:Wired: How to Stream Video to iPad