Did hold a lecture yesterday at “Bank & Finances 07.” Most of the Swedish market leaders in the business where at this full day seminar. One of the good speakers where from OMX Group, they are nr 1 in the world to provide stock exchange with IT. They do base there IT systems on Linux. The reason is that they are not then depending on a lock solution to develop in the speed they need to stay on top of the market.
There where a lot of speakers pointing out secure payment online. A lot of the problem in my opinion is that it are too easy to move money around online. Why not develop new software that marks al the money online (then you can track every unique euro)? It could be based on Linux (that is already in your wallet, provided by OMX).