What PS3 does have that's exclusive to sony is the blu ray disks for high def DVD's. However, if you factor in the high price for PS3's, plus having to buy the high def cords, ect, it's the same as buying the xbox 360 plus the high def DVD attachment.. So that's a wash.
Let's do a true comparison courtesy of Bestbuy.com (online comes with better deals/packages than anywhere IMO!)
PS3: $399
* Does
not come with games, or high definition cables. So add in two games and cables to the price which is what the xbox comes with. However, it does come with Spiderman 3, the MOVIE, not the game lol.
High Def Cables: $60
Two Games: $80 Low end prices at $40 per game
Total Price: $539
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Xbox 360 + High Def DVD attachment bundle: $579.97
* Comes with high def cables, TWO games, wireless headset, ethernet cables, wireless controller, ect.
Total Price: $579.97
So as people could argue, while the PS3 has high def DVD, you could easily pay a small difference and get the same thing in addition to a more powerful system in regards to graphics (double the framerate) and much greater gaming selection.