The Dark Knight were sold on day one in the UK (but isn't the day still ongoing?), 21% of which were Blu-ray. If our abacus is to be trusted, that's just north of 107,000 Blu-ray Discs, and it falls right in line with the apparent BD boom going on across the pond. Just for comparison, it took the white hot Casino Royale a full week in the UK to move just 10,000 BD units. Looks like the flick is off to a solid start -- we'll be keenly watching for US numbers as soon as they become available.