Black-Body Radiation Package
As of Version 10.0, black-body radiation functionality is built into the Wolfram Language »
BlackBodyProfile — create a plot of black-body spectral 
-distribution profiles
MaxPower — radiative power emitted by a black body at a wavelength
TotalPower — total radiative power emitted by a black body
PeakWavelength — wavelength of the maximum emission of a black body