Zimbler0:
re: "Does this mean I could store my BitCoins on my
hard drive . . . create a duplicate copy of
my hard drive . . . then sell them twice?"
No. First, if that were the case, someone would have done it by now. Second, bitcoins are, in essence, digital signatures that validate their legitimacy when they're exchanged. When transactions take places, the block chain gets updated and an old copy is no longer valid.

Gold is $1,581/oz today. When it hits $2,000, it will be up 26.5%. Let's see how long that takes. - De 3/11/2013 - ANSWER: 7 Years, 5 Months