Here are some exclusive features of ps3:
) Cell broadband engine. It's a somewhat more powerful machine for running 3d engines - as long as the developers make the game on a ps3 devkit first. It has 2 main cpu's and 6 more that can operate independently. A lot of games use one of other 6 to record video of games while you're playing them. I wish IL-2 would do that, since it clearly doesn't use them all.
) slightly better gpu turns 400gflops to 240gflops in the xbox gpu. Usually won't notice any difference.
IMO the Differances between PS3 and 360 are soo small that you have to be picky to notice them tesst has proven that the 360 was the better one all round
)online is totally free, though there's a viral hoax message still going around claiming it won't be soon.
Who cares it is Free? I got 13 Months of Xbox Live for 60 Bucks. wich is a Bargain IMO
) it's a blu-ray player - don't care that it's a blu-ray player? Well the games are also on blu-ray, and blu-ray discs can hold up to 50gb of data if they're dual-density. Metal Gear Solid 4 used all 50gb. The launch title Resistance was 16 gb.
) you can get a ps3 in pretty much any color as long as it's black.
The 360 is in more then 6 standerd colours available. I have the Elite Version, wich is Black. as it should be! 
) it has a web browser for if your pc breaks or something. Youtube works.
UpComming December Xbox has its Virtal 3D Controller wich aslo has Internet on it.
) things ps3's used to be able to do but can't (mine is a launch ps3 so it does them all): play ps2 games, run linux, have 4 usb ports, have memory card readers. launch ps3's also have been successfully swap-magicked for ps2 games, but I don't know if it still works.