I remember reading the same posts a while back and am also curious....there were also a few posts about how certain credit cards issue one-time-use cc#s to help prevent online fraud...I know one of the companies is Discover....the other 2 elude me at the moment. Legitimate, is that what you're referring to or are you referring to actual cards that are like phone cards that you can 'charge up' with funds? Either way, anyone with further knowledge please feel free to post