Last.fm recently added a feature to their profile pages that I thought was great. "Paste Your Taste" assembles a block of text describing your overall top music picks for use on social networking profiles.
For example, my current selection is:
I'm into indie, rock, alternative, electronic and experimental, including: Thrice, Queens of the Stone Age, Squarepusher, Plaid, The Avett Brothers, Radiohead, dredg, The Dillinger Escape Plan, Poison the Well, Muse, Mastodon, The Books, The Walkmen, Shiner, Incubus, Against Me!, Spoon, mewithoutYou, Iron & Wine, The Beatles, The Decemberists, Arcade Fire, He Is Legend, Death Cab for Cutie, Paul McCartney, The Smashing Pumpkins, Annuals, Codeseven, Slow Runner, Nine Inch Nails, Foo Fighters, Aphex Twin, The Knife, Ebu Gogo, Prefuse 73, Head Automatica, Silverchair, Deftones, Far-Less, Kaki King, Clark, Cory Branan, Killswitch Engage, Maximo Park, The Life and Times, Elliott Smith, Department of Eagles, Bloc Party, M83, The Streets.
Check out my music taste: http://www.last.fm/user/heyrevolver
Compared to the other technology working on their site, the "Paste Your Taste" functionality is nothing special. However, it solves a common problem—albeit a minor one—and makes it very easy to share your own taste in music. A great example of a feature that compliments the service while requiring minimal development.