There's a board on the topic at the Breast Nexus "natural breast enhancement" forum. Since massage seemed like a low risk thing to try, I decided to start doing it daily a year or so ago. I do it about 100 times once or twice a day. I can't say it made for particularly noticeable visual growth, but they definitely are softer and squishier to the touch. I think massage would be a good thing to do in combination with any other breast enlargement method, though, like HRT for instance.