First, some of the best Tolkien artwork I've ever seen, featuring the final moments of Balin. The artwork is by David Gaillet who has a gallery on Deviantart.
Pretty crazy stuff, right? I especially like the way the small like Mirrormere lives up to it's name . . . your really are looking into a mirror!
Sweet, sweet music . . .
Last but not least, DarkJackal gives us a ton of fascinating links to the complete soundtrack (including the Misty Mountains song) from The Hobbit trailer, plus more links to various discussions about the trailer music and Howard Shore's Hobbit work.