If you have a TV that accepts 576i, as almost all new TVs do, then it doesn't matter what region PS3 you have, it will play PAL video.
If you have an older SD TV that is limited to 480i, then no matter what region PS3 you have, it won’t play PAL video in native resolution... but you can set the PS3 to scale the video and output in 480i, so again, no problem.
Of course for those with a HDTV all of this is irrelevant, as nearly all HDTVs accept 576i, but more importantly, nearly all games and videos have native HD versions, and of course you can set your PS3 to scale and output in HD, so again, no problem. 👍