A branch of Boomerangs opened this summer in Central Square (near my new neighborhood of Cambridgeport) and is throwing a store opening party this evening. If you are a Boston resident, you are probably aware of the mission statement of this small chain of second-hand shops. They donate 100% of their proceeds to the AIDS Action Committee of Massachusetts. So if you are a Cambridge resident, or in the area this evening, I recommend swinging by for a glass of something yummy and some shopping. I hear this location has an amazing used book section.