Dear Chron: I'm writing because I wish there were an organization for Austin like MoveOn.org – something that could mobilize people to act quickly in a local situation such as the development near Hamilton Pool, for example. There are countless political/environmental issues involving Austin and the surrounding area about which I think a lot of people would be likely to join forces. I don't feel that I personally have the knowledge or resources to start a Web site like that, but it seems like an idea whose time has come. Any ideas? I realize that organizations such as SOS (which I applaud and thank every day of my life) exist and send e-mail to large groups. But maybe something even larger and more inclusive?