Gizmodo published a review of the Sony PS3 remote control.

Sony offers a Bluetooth remote control for the Sony PS3 to give you a better option to watch movies on the PS3. You can also of course control the movies with the SIXAXIS controller. I tried this already and it is not too bad for the usual things you want to do when watching a movie.

Quote from the review:
"What makes it useful are the dedicated buttons for playback, slow motion, scanning, and track control; there are also dedicated controls for changing angle, audio tracks, subtitles, and pulling up in movie menus.
That's really annoying stuff if you're trying to do it on the SIXAXIS. "
Read the full review.

Because the PS3 works via Bluetooth you cannot use universal remotes with it.
The Sony BD remote sells for $24.99 on Amazon.