Three things I love about the PS3 that have nothing to do with games:
2. Using an old laptop as a "media server" and streaming video to the PS3 using PS3 Media Server. So far this has worked very well with my Mac and PC. And has stifled my thoughts of getting a Boxee or Apple TV.
3. Being able to control the PS3 using my TV remote. Now, this is probably only because I have a Sony Bravia, but the fact that I can power off/on the console, control video playback and even navigate the XMB without using the controller or going out and buying a remote is awesome.
I wish the xbox 360 would do this as well, but alas: HDMI 1.2 support not HDMI 1.3.
Despite this, the XMB *is* much easier to navigate through compared to the Xbox dashboard. I do think it's a bit easier to setup parties and invite friends to games on the Xbox side of things though.
(Regardless, I find myself using my PS3 more than my 360 as of late).