While good programmers may know a number of these by heart, it pays to have a reference. Before you reinvent the wheel, consult the list of computing and mathematical algorithms.
Pandora-like in its mission, but a different approach. Instead of music genomes, it uses a social approach. Last.fm will actually learn as more users come in.
Both of the movie trailers were excellent! And Spin definitely filled the WTF quotient.
I'll have to play with Last.fm and see if I like it better than pandora. It's an interesting angle as I frequently have wished I could tweak the parameters in pandora in some way other than saying I like/dislike a song.
I haven't come to a conclusion about Last.fm yet. Still playing with it. I saw an interesting article comparing the two technologies -- I'll have to dig that up and post about it.
I still love Pandora, btw. It really has introduced us to some excellent music, including Ronnie Earl, a Boston jazz musician with a ton of bluesy soul to offer.
Coolness. I think we need to set up some controlled scientific experiments and probe the strengths and weaknesses of both technologies. I think they both have merit.