There are 11 million bitcoins in circulation right now with a collective "market value" of around $1.4 billion. You can spend bitcoins online at shops like BitcoinStore.com, but they're not exactly a mainstream currency for everyday transactions.
Lee would love to change that. He's an early pioneer in the Bitcoin retail economy, and a sign on his clinic door advertises his accepted forms of electronic payment: Visa ( , Fortune 500), MasterCard ( , Fortune 500) or Bitcoin.
The sign alone hasn't generated any business, Lee admits.