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First, you need to know that PS3 is a very powerful machine and if you want to use them as a media center trough the computer, it is perhaps your computer is not so fast, it can play the big Blu-ray movies . You can transfer movies, pictures and music directly to your PS3!
If you want the best from your PS3 as Media Center, you can install Linux on it.
It's a bit difficult, but there are great leaders, to put it simply Google search for Linux + Playstation and findit.

If you stream trough the computer that I think is the best way of a cable to the hub, but a fast wireless will have to do it. So if you have chosen.

Then you need good software, the movies music and pictures on the TV screen to get.
The best software I have found is PS3 Media Center X from Red Kawa to use this simple program and all the things you need to now is there on site. If you want to transfer movies, you need to convert them: PS3 Video 9 is thata free video conversion application developed by Red Kawa. It allows you to convert your computer video files (AVI, DivX, MPEG, etc.) into the specific video formats that are playable on the PlayStation 3 this can. A little time, but it's definitely worth it. You can see some before you go to bed and they are ready when you start to wake up!
So now you have run it wired or wirelessly to your TV and converting movies to your PS3.Some films really great, so IThey think will buy the premium version with 60GB HD.

This was just a quick tutorial on how to expand your PS3 to a Media Center.