My fiancée' updated my PS3 to 3.60 while I was out of the house and it bricked as well. It seemed fishy but I couldn't find a good instance of this happening to anyone else so I just thought I was unlucky, until now.
Turns out I have an original 60GB and the only modification I made to the system was installing a bigger HDD (Just like two of the others on this board that had the same problem).
I pulled my system apart, cleaned it, and even applied some high quality thermal paste to the CPUs and the YLOD still persists. I may try swapping out the HDD for the old one to see what happens, but this is NOT just a coincidence.