The Carnegie Medal, for an outstanding book for children: The Graveyard Book, by Neil Gaiman.
The Kate Greenaway Medal, for distinguished illustration in a book for children: Harry & Hopper, illustrated by Freya Blackwood and written by Margaret Wild.
(Brief review here.)
This makes Gaiman the first person to win both the Carnegie Medal (British) and the Newbery Medal (American) for the same book. Sharon Creech has also received both medals, but for different books - Ruby Holler and Walk Two Moons, respectively. The Graveyard Book was also shortlisted for this year's Greenaway Medal.
ZUI this article from The Guardian.