I am de-lurking here - to link you to Collective Shout, a website enabling collective action against blatant sexualisation of girls in the media. It is Australian in origin, but I think most of the ladies who post here would be interested in the work being done, inspired by the results which have already been achieved and would find the Resources section interesting.
www.collectiveshout.org
Well done to all of you who complained about those Topman t-shirts. They were appalling.