I was at the Wicker Park Farmer's Market last Sunday and started chatting with some of the friendly volunteers from the Wicker Park Garden Club. They have tons of great programs -- helping get kids involved in building gardens as well as helping local gardeners with plant selection, wormboxes, and transforming the fountain in Wicker Park through landscaping. They always have room for volunteers, and are also offering a lecture series this fall that's outta this world (email them for details; they haven't gotten the new lectures up yet.)