I was amazed that I could get GPRS service on my phone while in Canada. GPRS meant I could send and receive email. Ok, it wasn’t terrible fast 5,760ft up in the middle of nowhere, but it worked, so naturally I bcc:ed a few people photos I’d taken with the phone. So much more personal than a default postcard, IMHO. And faster. Probably not cheaper.
Today I received the same back from a friend on holiday in Greece, so I can confirm that, on the receiving side, I prefer this to postcards.