Dunno if it will make alot of difference in changing the believe men OR women have that "it's the woman's fault," because that rape myth is deeply entrenched in our culture. It will take more than a few posters to change that. However, I think posters and adverts and such can be useful in the context of more "hands on" work with young people, exploring and unpicking rape myths, blaming, gender stereotypes, etc. and so they can work out for themselves how to scrutinise societal messages and not just take them at face value.
My beef is that advertising campaigns are so flipping expensive to get the kind of saturation coverage you need to make people stop and think (and even then, it doesn't mean they'll change their attitudes or behaviour.) Charities, women's organisations, etc. don't have that kind of cash to throw away and I think they can make more inroads by trying to influence public policy at one end and doing stuff with young people at the other end of the spectrum.