http://enjoyment.independent.co.uk/books/reviews/story.jsp?story=83991 is the Independent newspaper review of American God, and the word from the UK Booktrack charts is that we continue to creep up steadily: from 19 (pre-publication) to 16 (last week) to 12. Now that the reviews have started to appear, I hope we continue to rise.
The UK Booktrack system is interesting as, like Soundscan for CDs in the US, it tallies sales through every outlet. There's no US equivalent. Publishers pay it more mind than the public do, though.