I am currently reading through the papers that were posted from the presenters at Siggraph. Thanks to Tim Rowley for providing this page and the links. There is quite a bit of good information here to digest. Unfortunately I did not attend Siggraph this year as my focus in the past has been more cad oriented but obviously this has been shifting to digital visualization (of which cad is still a part of).
I am especially interested in reading the writings of Henrik Wann Jensen. If you have ever used Photon Mapping but do not fully understand the process be sure to read some of the articles (and books) from Henrik on the subject.
Happy Rendering...