I just thought I'd share with you all this YouTube documentary I found about the evolution of battleships on SuperiorHistory's channel.  There are 4 ~50 minute segments, I'm only 10 minutes in to the first one, so I've got a bit to go.  It starts discussing battleships and naval warfare under sail, so if you're not too interested in the old British fleet, you might want to skip to number 2.  Undoubtedly they will discuss WWII battleships and I'll be damned if they skip over the Yamato class, but here's the first one: The Steel Battleship.