References and resources on hyperspectral (multispectral) image processing
What kind of information are you after.  Are you looking for information on how to process the  images from a data processing point of view?

Or from a theory point of view? 

Are you looking at satellite images?  if so land or water?

Proprietary software look at ENVI 

http://www.exelisvis.com/language/en-us/productsservices/envi.aspx

for free software look at SeaDAS

http://oceancolor.gsfc.nasa.gov/seadas/