Do we have any examples of "affinity" marketing for carpooling, vanpooling, transit, and related modes? What marketing campaigns have focused on ties with groups, interests, causes, etc.? What was done, what did it cost, and what results were achieved?

Is there any evaluation (quantitative, before and after, not purely anecdotal) which examines similarities, differences, effectiveness, etc. between information campaigns, incentive campaigns, affinity campaigns, and other approaches?

-- Tad