Leviathan by Scott Westerfeld

An eight-legged thousand-ton iron frigate that moves like a deadly giant spider over a frozen wasteland.  A flying eco-system battleship made up of a sperm whale, bees, bats, falcons and hydrogen gas. These are just two of the amazing creations you will discover within the pages of Westerfeld's startling new steampunk series. It's the Austrio-German [...:]