Amazon has launched "Your Music Library". Thanks to Steve Rubel for pointing it out. If you, like me, have used Amazon's One Click feature to generally order new books or media that you've seen online, it's either
a) a frightening history of everything you've ever ordered online, including baffling purchases (A Billie Holiday CD? That must have been a gift for someone) and reminders of books that resonated (competitive Scrabble? far more interesting than you'd think).
b) a frighteningly comprehensive look at media purchases, providing an evolution of your personal online spending.