OK, it doesn’t exist yet, but I want it. For those who don’t know about Mapdex, it is a huge index of web mapping services you can search to find datasets from around the world. Part of ArcGIS Explorer includes is a section that allows you to program tasks. I’d love to be able to type in a search and allow Mapdex to find the layers and then have them appear in ArcGIS Explorer. Since ArcGIS Explorer supports so many file types it could become the way to find GIS web mapping services. In fact ESRI should contact Jeremy Bartley right away to make sure this task makes it into the default ArcGIS Explorer program.
I’m not sure what ESRI has planned for the beta release, but hopefully they’ll have good support for creating and sharing these tasks (its that community thing again I’m always talking about).