From URISA Board Member, Carl Anderson...
As some of you are aware, OpenStreetMap is having its US State of the Map (SOTM-US) conference in Atlanta this Aug 14-15 (a weekend). At $35 the event is fairly inexpensive and will be filled with passionate mappers from across the US. Unfortunately there is not much advance notice, but I see that airfare that weekend is fairly cheap.
http://www.sotm.us