What I like about my PS3 is it does many things.
It has a built in wireless adapter(60gig and 80gig), so you can surf the net and stream mp3's,video and pictures to it from your home network. It has a browser that works well, Im going to get the logitech wireless keyboard soon. You can also copy files from your network to the hdd if you dont want to stream them.
The blue tooth is cool, with the range some guys have the PS3 in another room than they are using it in.
The SD upscaling quality is phenomenal, and the BR PQ stays in the top 3. The ps3 video is software based so it can be improved by FW updates. This is how they added HDMI 1.3 and upconversion after it was released.
The future standalones may end up with a better PQ, but I think the PS3 will hang with em. Right now they have no wireless, no media streaming capabilities. If you dont care about this, get the 2nd gen samsung BDP1200 or the upcoming 3rd gen. Both have the Reon chip and excellent PQ.
If you want a media hub, the ps3 is very nice.
It also plays the occasional game