If you live in the Connecticut area, take a look at HollaBack CT, from feministgal at Oh, You're a FEMINIST?!.
I seriously love HollaBacks - they empower people by giving them a means to react in a safe manner to their street harassment. In a harassment situation that's completely about power, someone may not be comfortable enough to say something, or it may not be safe to.
In May, Mildred Beaubrun ignored catcalls from a car of men at a gas station, and they shot her and her friends. She died. All because they wouldn't give out their phone numbers.
It's not safe anymore for women in public. HollaBack is a great, safe place for venting and alerting other people to the creepy people out there who think that women's bodies are public property.
So check HollaBack CT out, even if you don't live in Connecticut.