This bitcoin mining that's going on sounds like digital stealing to me.
The mining is maybe a bad choice of words. If I understand it correctly, the mining is done by supporting the computing power needed to support the distributed online database of bitcoin. They get paid (mining) when and if they are first to complete the data crunching needed to support and update the online database.
The currency, like Gold has a limited supply, that flat lines over time at limited number of coins, 21 million, and that insures the currency is deflationary, and thus increases in value if the use of the currency grows.
This reminds me of the early days of Ebay, Google, Facebook, but the odd part is it has no central ownership, authority or control, it is very unique! Namecoin is copying it.