Jeremy Zawodny posted some thoughts earlier today about digital music collections. He wonders:
Soon, being able to scan your friends music for common discs will be gone too.
I wonder what the digital version of that will be?
I think the aswer to your question is social networking sites like AudioScrobler which monitor your listening habits via various media player plugins (itunes, xmms, etc supported).
Heres my profile… I’ve only been using it a week or two. Unfortunately it doesn’t seem to watch the music I listen to on my iPod. I think I listen to completely different things while in my car (podcasts, audiobooks, different music, etc).