As part of an industry-wide self regulatory effort, Media6Degrees has been displaying a notice in its advertisements to help consumers understand their choices around privacy. I recently posted an update on how that program was performing:
[T]his initiative provides real information and choice to the subset of people who are interested in opting-out. A 3% post-click conversion rate is not bad from a direct response perspective. The people who are concerned about their privacy are taking action when the option is offered to them. This is exactly how the program is designed to work.
You can read the whole thing here.