I was reading this excellent and instructive paper -- actually, it's a thick
book! -- about raytracing and photon mapping by a Pixar guy and photon mapping
father Henrik Wann Jensen:

http://graphics.pixar.com/HQRenderingCourse/paper.pdf

it's from august 2007 and is still pretty fresh.  Great reading...

that URL BTW is full of enrichning CG goodies...

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