I read this on gamespot:
"Our MP3, WAV and AAC files played perfectly, but we had some trouble getting the PlayStation 3 to recognize files with the MP4 file extension. The console could identify the files as MPEG-4 AAC audio files but labeled them as "corrupted data" when we tried playing them."
Does this mean MP4 files the kind that the PSP plays cannot be played on the Playstation 3 at the moment?!