5/26/09—This evening from 5 PM PST to midnight, ArcGIS Online will undergo system upgrades to improve our infrastructure. These system upgrades will provide a more robust environment to support ArcGIS Online services usage today and as it continues to grow. Tonight’s upgrades will be made for the system that supports ArcGIS Online map services (i.e., services.arcgisonline.com and server.arcgisonline.com). We anticipate minimal impact to your applications during this time, but you may need to reconnect to the ArcGIS Online servers. However, if you experience any ongoing service availability or performance issues as a result of this change, please post a description of them to this blog.