These collaborationsystems
let participants vote on various things, and eventually see the
results of the vote. Voting normally requires automatic tabulation to
avoid subjective bias. A voting time is relatively short lived, but
voting systems should stick around awhile.
HOMR -
Helpful On-Line Music Recommendation Service collects your
ratings for a number of music performers, does some magic
statistical correlations with other people's ratings, and
returns a list of other music that it determines you might like,
based on the likes and dislikes of other users who seem to share
your taste.