I will write some stuff about the Planck mission soon. In the meantime check out these pages about Planck:
- The official site: http://www.rssd.esa.int/index.php?project=planck
- At ESA: http://sci.esa.int/science-e/www/area/index.cfm?fareaid=17
- The CalTech site: http://planck.caltech.edu/