iTunes Genius

I've recently discovered a new little feature on the iTunes software that comes in quite handy.  It's called Genius.  Basically what it does is arrange your songs by similarities and style.  Simply, you pick a song from your iTunes library, click the Genius button and Genius automatically goes through your entire library and pick out songs that are similar to the one you chose.  I doesn't have to be the same artist.  Way cool.  Now you can decide what kind of music you're in the mood for, click Genius and it comes up with a playlist for you in an instant.