You may or may not be aware that today is also Hermione Granger's birthday.
http://www.youtube.com/watch?v=k3p_Kewu7jc
(Since i'm not sure if it's mentioned in the video comments, the artist is Tom Smith, who is also the creator of the official Talk Like a Pirate Day theme song. His web page is here: http://www.tomsmithonline.com/index.html)
Also, confirmation bias suggests that WinAmp knows what day today is, since it's randomly played Paul and Storm's Captain's Wife's Lament twice this morning.
http://www.youtube.com/watch?v=4A2EmIU1Qj8
It should be noted that of the 3424 songs in my current playlist i have two copies of Captain's Wife's Lament. One is 3 minutes long. The other is 10 minutes long. The above video is almost 40 minutes long. They actually start the song somewhere around 16-18 minutes in.