That was an awesome commercial (and I should record it)... My brother checks out those sites all the time. He visits
http://www.bfro.net and
http://gcbro.com . He suggests people check out reports for their local area.
Going to briefly promote this awesome site:
http://www.musicmobs.com/ . Great online music tools (rss included). You can see which other users are most similar to you, upload playlists, and get automated recommendations based on up to 3 artists you enter (
http://www.musicmobs.com/recommendations ). Site benefits from your use of iTunes, however both OSX and Windows platforms are supported, and I believe anybody can submit playlists.
You can see stats on my collection here
http://www.musicmobs.com/user/Peppermint%20Pig