Over the weekend I finished Boneshaker by Cherie Priest.

Basically an excuse to combine two popular memes - zombies and steampunk - Boneshaker is set in an alternate Seattle where the core of the city was undermined by a giant digging machince called the Boneshaker.  This digging also released some poison gas that continues to seep out and turn people into zombies.

The book follows the son and wife of the man who built the Boneshaker as they venture into the sealed city and encounter various of the denizens, and get involved in the political struggles inside.

It's an OK read, but I'm not sure why it is getting the rave reviews and awards nominations (including a Hugo nomination).