That's interesting. I didn't realise that there were some currencies that involved useful calculations (OK so not useful, but practical in some way at least).

That's interesting. I didn't realise that there were some currencies that involved useful calculations (OK so not useful, but practical in some way at least). Reminds me of http://www.distributed.net/ http://www.distributed.net/ - it's like their distributed computing but with a currency as a side effect!