I currently use an SDR to capture ADS-B messages, but it can also be used for satellite images fairly easily:
http://www.rtl-sdr.com/rtl-sdr-tutorial-receiving-noaa-weath...
http://www.rtl-sdr.com/rtl-sdr-tutorial-receiving-noaa-weath...
Found the beginning article to the series here:
http://www.rtl-sdr.com/setting-up-a-goes-weather-satellite-a...