David drew my attention to this article, and I have to say I hadn't heard of the MS codes before, and I have to agree that I think I would stick with non-proprietry codes which have a distinctive look (i.e. QR Codes). I have played with a few codes, and have one for my project bigbible.org.uk - but as we're trying to draw in those scared of technology I haven't used it in any publicity... yet!

Best
Bex