I forget what comment this morning sparked this feature request -- which underscores the value of standards and interoperability -- but I'd like certain data about me to be available to the web services I use. For example, iTunes (the software that supports the iPod) allows me to export my song list as XML. That's cool. What I then want is to use that XML to create a songroll for my weblog. I want Orkut or LinkedIn to read that XML and help me find people who have similar tastes so I can go to their blogs and read their songrolls (and their posts). Do the same for my Amazon book orders and other forms of data about the things I do and like. 

This sort of automated sharing would build connections much better than anything the social networks have going now.