One of the best features of Xbox Live is the extension of it that exists in web format. Friends lists, messages, achievments and now the marketplace are all available anytime, anywhere. After 2 years, the folks at Sony have finally matched suit - as PlayStation Network accounts are now available on PlayStation.com.
Right now the features available include friends lists, bio pages, and your avatar. No word on trophy support...yet. Now all we need Sony to do is to come up with community features and events like that found on XBox.com and we can have an official PlayStation 3 Co-Op Night!
Source: Blog.us.playstation.com