This isn't a timekiller per se like most of these have been; in fact, it might help you get your homework done. Rather than trying to keep that perfect playlist in order, why not listen to something you've seen a hundred times? The lulling sounds of Friday ushered me through a history paper a few weeks back.
Listen to a Movie has the streaming movie audio game on lock.
They seem to think it'll help you get through the tedium.
Hell, listening to some of these documentaries is almost as good as seeing them.