I just ran across this group at Last.fm..
..it’s denizens post articles about and pointers to cool little gizmos/widgets/whathaveyous that one can use to leverage Last.fm data.
I ran across it via this person’s profile..
..he has a personal website where he offers..
..that article, and a web interface to his various tools.
=JeffH sez check it out
[update] ps: note that sites such as last.fm have relevance to the more general notion of identity in that publishing the music one listens to is an aspect of one’s identity.