In 2006 IGARSS returns to North America to the exciting city of Denver, Colorado. This important western U.S. city is not only the capital of Colorado but also a central location for science and technology distributed along the Front Range from Fort Collins in the north to Colorado Springs in the south. Just northwest of Denver is Boulder where the main campus of the University of Colorado is located, along with the National Center for Atmospheric Research (NCAR) and a National Oceanic and Atmospheric Administration (NOAA) research facility. Boulder is also the home to Ball Aerospace while other aerospace companies such as Raytheon and Lockheed-Martin have major facilities in the greater Denver area. There are many other remote sensing technology companies located in the Front Range, adding to the rich science fabric of the region. For this conference we have received over 2400 abstracts from scientists the world over who will be coming to Denver to experience the Rocky Mountain High and the facilities of the newly expanded Colorado Convention Center. We have divided the technical program into half invited sessions and half general sessions and anticipate a good attendance at both. The Technical Program Committee meeting was held in San Juan, Puerto Rico where the many abstracts were organized into oral and interactive sessions. This effort as always has been supported by a large number of remote sensing scientists and we greatly appreciate their efforts on behalf of this conference.