@chenguo4: Putting VLC onto the PS3 is not an option, Sony would have their ass sued from here to the moon. The video and audio codec field is filled to the brim with patents, patent trolls and patent fee agencies. Which is why Sony has been rolling out their codec support one by one, as their legal department goes over all possibilities and makes sure all needed license agreements are in place.
My personal frustration is that there seems to be no combination on the PS3 atm which allows me to combine h264 video with ac3 audio (perfect for putting copies of my dvd's on it). Have seen some reports that putting those two codecs in a MPEG TS container format works, but I haven't been able to create such files yet.