From what I read on the site, it doesn't look like this is a physical sim at all, it's just a random number you can direct people to, which has all texts emailed to you.

Does it just handle SMS or can it do MMS and stuff? So many possibilities here...

I feel like the smaller alt-coins are gaining for value as people jump ship to them because "oh no, bitcoin is dying, let's all move over to X!".
That's what it seems like with litecoins at least, aren't they USD$2 now or some such?

That's a very neat idea.
I'm curious though, as it's a Polish number, won't most people (e.g. outside of Poland, which I'd say is a fair share of the net) be charged international fees?