Let me just say: Chaka Khan.Really the conference was extraordinary. The opening session, stunning. The sessions, strong. The networking, friendly. The colleagues, creative and sharp. The closing panel discussion, important, and Paul Hawken's closing comments, inspirational. Much of the action was covered live by the folks at MediaGuns.Somehow, the planners were able to create a conference appropriate for nearly 5000 VISTA leaders, AmeriCorps members, SeniorCorps directors, nonprofit execs, foundation program officers, "capacity-builders" like me, and corporate executives. Anyone in this…