I've used Bitcoin a couple of times. Was created as a form of currency separate from government control and tracking as well a fluctuations in the market. Didn't quite work out that way and there have been reports of accounts being hacked and compromised but that has happened with traditional banking as well. It gained some notoriety as it is often used for transactions were users need a level of anonymity. Political activists, dissidents and the underground online black market community. It is a little complicated and can involve PGP encryption and other forms of technical esoterica, but not impossible. I have my doubts about online privacy on-line though. Forum member Grix actually has a bitcoin laser store set up already.
~ LB