Too bad, if you had an xbox you could play with me...
BTW, xbox is so better...
Netflix - Party mode; chat with friends as you all enjoy a movie at the same time.
Online - More of a "premium" service, sure you have to pay, but it's more reliable and has better features.
Last.FM - Radio on your xbox, streamed online.
ESPN Channel - Coming this winter, stream espn with friends online.
And yes, I have owned a PS3