Palimpsest by Catherynne Valente. I'd heard great things about it and picked it up a while back, just getting to it now. I'm finding the characters difficult to relate to, and don't really think any of them are acting like people really tend to behave, but the writing is lush and the world is dazzlingly surreal. To quote one particular line that made me positively gleeful, one character, in reference to books and why she doesn't like them, observed - "Their natural state was to be shut, closed, to grin pagily from shelves, laughing at her...".
Grinning pagily. GRINNING PAGILY. I can't quite express how much I adore this phrase.
There are a few other such gems tucked in here and there as well. Delicious.