> 2) Is it a great idea to broadcast someone's card numbers so clearly? The graphic is so obviously a credit card, it would be easy for any onlooker to spot and steal.

yes - anything that signposts card data clearly to an onlooker is problematic, but any malicious shoulder surfer will probably be able to spot a payment page a mile off in any case. This might however, have a small possibility of encouraging opportunistic theft.

I think the bigger threat to this probably comes from the networks (MC, VISA, AMEX etc) who get VERY possessive about mock-ups / card image facsimiles that use their logos. The brand logo protection that they enforce is pretty strict and I would imagine this approach would not be welcomed. I'd like to be wrong, but my experience with the networks makes me pessimistic.

I'm less concerned with the reuse of their logos and more concerned with the fact that their logos are implemented in HTML/CSS rather than as images, which means there will be subtle differences.

Basically those aren't their logos. They're slightly inaccurate imitations. Most big brands will be upset if even a few pixels are off when their logo is displayed.

You're right, point 2 is THE show-stopper for this. It looks amazing, but if amazon or the likes ever tried this I'd close my account - credit card security, in this day, is not the place for gimmicks. Sorry.