Oh gods, that sounds like a horrible idea (the site is unavailable at the moment, so I can't see the list of features). Only slightly worse than the idiotic start-up idea that made the rounds two years ago, whereby all of one's cards could be combined into one (Oh goodie, if I lose one card, I lose EVERYTHING!).

Well, you generally lose everything either way anyways. I would imagine most people lose their entire wallet, instead of just a single card.

r.e. outage - Sorry about the blip, auto scaling was a bit slow to respond, tweaked and should be fine now :)

It could be handy if when it runs out of battery it remains as the last selected card. Not sure if the re-programmable strips require a charge to hold their pattern.