We've just published an Explorer Fire Perimeter Map which you can open from the ArcGIS Explorer Resource Center. From Explorer, choose File, then Resource Center, and look for the newly published map in the lower right.

The complete map includes a connection to a fire perimeter service which is updated at regular intervals. Explorer will automatically refresh the service every 15 minutes to check for perimeter updates.

The map includes a collection of results which can be clicked to navigate to each fire area. Clicking the result pushpin will open a direct connection to the InciWeb site (if an entry is available) for the latest fire status, news, maps, and other information.

The US Topo Maps layer has also been included, allowing a quick toggle from the contents to view the perimeters with topographic maps.