There are various experiments going on right now for new form, or alternate forms of money.
There is BitCoin, also ebay like service for 'credits'.
I am seeing a rise in barter. Barter is the death knell for fiat currencies and government, as it is the ultimate black market. Barter makes it near impossible for governments to collect taxation, the lifeblood of operations.
I ran across such an experiment today, called Trade School.
It is very interesting where this all goes.