If you want to try out microbits and ceptacle/cash please send me a mail. The cash service is *giving* out real money, until I get it approved at the payment provider, so that is why it s restricted.
Sorry about the .zip file - I got a bit side tracked creating it, but I can guide you through if you like.
Also have a look at the microbits presentation from BitCoin 2012:
http://ceptacle.com/presentations/microbits.pdfCheers,
Michael