US // UK
The UK cover is my favourite here, hands down. It's so magical and pretty, and even nicer in person -- it's all shiny and reflective. I do like the US cover, but I think it looks too dark. The title font is lovely though, and I would be intrigued if I saw it in a bookshop.
Well done to Hodder UK for this cover, it's one of my top covers of 2010 so far!