Universal remote controls use infra-red. The PS3 communicates via Bluetooth. Which, up til now, has meant the console wouldn't work with universal remotes. But no longer!
Yes, the mysterious PS3 IR adapter from Logitech (which we've covered previously) is now out in the wild, and any and all questions you may have about the device have been answered. The adapter is powered via a powerpoint - so no need to use one of your PS3's precious USB ports - and will set you back $60.