Merrill (nyse: MER - news - people) is one of many Wall Street brokerages doing a large-scale Linux deployment in an effort to cut their costs and boost revenue...
... Merrill's plans, and others like it, are very significant because they are the first companywide--rather than departmental--Linux implementations. While not without risk, this lends an enormous amount of credence to the argument that Linux can be used in place of more established technologies like Unix. [Forbes]