A year and a half ago I made this post, which includes a video on how Ven Digital Currency was beginning to change the very nature of money. The idea is that money could become a truly virtual concept, facilitating trade on a global scale. This would ultimately eliminate the need for government backed currencies like the dollar and euro.
Well, here is another virtual currency that has been getting a lot of attention, Bitcoin Virtual Currency. My guess is that these virtual currencies are just the beginning and will be a common notion in the near future. Here is a Time Magazine article which discusses virtual currency in more detail.