1mdc.com: A digital gold currency.
e-Bullion.com: A digital gold currency backed by physical gold that also allows you to trade physical gold for currency.
e-gold: Worldwide electronic monetary/payments system. e-gold is backed by physical precious metals including gold, silver, platinum, and palladium.
GoldMoney: Digital precious metal currency backed by physical gold and silver.
Paysilver: Electronic currencies backed by gold, silver, platinum and palladium. Payment system allows micropayments and provides statistics on holdings and transactions.
Pecunix: A digital gold currency backed by physical gold.
The Phoenix Dollar: A digital silver currency backed by physical silver.