General Information on Cosmic Ray Astrophysics
There are several good internet sites that provide general background information on cosmic rays and supernova.  These include a summary written by Richard Mewaldt of the California Institute of Technology, a Scientific American article, references in the Encyclopedia Britannica on Cosmic Rays and Supernova as well as Funk & Wagnalls Knowledge Center articles on Cosmic Rays and Supernova.
Scientific Ballooning
Sites on Scientific Ballooning include that of the National Scientific Balloon Facility (NSBF) as well as a site at the NASA Wallops Flight Facility (WFF).  In addition, here is an excellent site maintained by the Max-Planck-Institut für Kernphysik that contains a list of web links to Cosmic Ray, Gamma Ray, Neutrino and similar experiments from across the world.
Science in the Antarctic
The National Science Foundation (NSF) manages all U.S. research in Antarctica.  In particular, the NSF Office of Polar Programs (OPP) is responsible for conducting Arctic as well as Antarctic program. From the OPP site one can find information about ongoing Antarctic Science projects and the support infrastructure used to assist scientists with their research.  In particular, Raytheon Polar Services manages this infrastructure for the NSF.  Raytheon also publishes the The Antarctic Sun, a newsletter about research activities in Antarctica.  Another interesting site is the United States Antarctic Resource Center (USARC) which is maintained by the United State Geological Survey (USGS).  The USARC contains a wide variety of pictures, satellite images and maps about Antarctica.
Some favorite NASA links
While not necessarily directly related to the ATIC program, one of our favorite site for current articles on space research is Science@NASA which is sponsored by the Science Directorate at NASA's Marshall Space Flight Center.  Science@NASA also contains a link to an excellent classroom resource called Thursday's Classroom.  To keep track of the latest news about the International Space Station and Shuttle missions, we always turn to NASA Human Spaceflight.