Dole et al (2006, AandA, 451, 417) resolved the Cosmic IR Background in the Far-Infrared, and compiled the latest observations of the Extragalactic Background Light (EBL), in particular for the Cosmic Optical Background (COB) and the Cosmic Infrared Background (CIB).

Load H. Dole's presentation (June 2006) explaining how Spitzer resolved the CIB. You can use these slides without permission as long as you cite the authors and references. [pdf][ppt]

You can also read the joint US and French April 2006 Press Release (NASA/SSC and CNRS/INSU)