Well, there you go! I'd always thought blu-ray was spelt: Blue Ray. That makes more sense to my ear, but obviously I'd never actually seen the word written. So blu-ray it is - or even bluray in some cases (mistaken cases, I'd suspect, but that's by the by). Why it should be spelt oddly is a bit of a puzzle, since it relates to the blue violet laser that makes the thing work, but blu without the 'e' is what it is. Maybe the people who put it together couldn't spell - nothing would be...