I do not know what a scrobbler is but there is theis site called Audioscrobbler that is gathers music play stats from individual users through the use of a player plugins.
Very neat idea. It also gives you the ability to find similar artists to ones you like and find other people who have the same tastes as you so you can hunt for new music to add to your collection.
Now, all I need is a broadband connection. Are you listening Telstra?