Obviously not a priority but it would be great long term to be able to tie in
the location of a user to various information.
User location could be used to highlight forthcoming tour dates of an artist
in their library (or recommendations). I haven't spotted any open alternatives
to something like Fire Eagle but there is Geonames
or Gisgraphy which provide a places search
service (creative commons license). The other stumbling block would be
attaining the tour dates themselves.
Users could allow their location to be visible to other users that have a
similar musical tastes.