I believe the easiest way to enable video (and audio) streaming from a PC to your PS3 is to turn on Network File Sharing in Windows Media Player. You will also have to enable this in the PS3. As hugh stated previously, there are clear instructions on how to do this in the PS3's documentation and online user manual.
All multimedia files in the file directories you have mapped on your PC will be recognized by the PS3.
I use Windows Media Player 11 to stream to my PS3. Earlier versions won't work. You have to add your media to your "library" for the player to stream it. You can set it up to add media automatically when it is added to a certain folder.
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