I love last.FM. Tagging and “Neighbor Radio” are my two favorite features. I wish there was a feature where last.FM would take the average geographic position of me and all my neighbors (people with similar taste), and interpolate where where my taste lies on the map. Alternately, the interpolation could be based on the location of the artists that I like.
In either case, I think I’d probably be in the middle of the Atlantic. Of course taking Australia into consideration, and the fact that the earth is a sphere…?