just looking at the various stuff coming from siggraph (check Atom blog for some onsite info)
light propagation (first bounce GI) in CryEngine3
http://www.crytek.com/technology/presentations/
And more links from siggraph at beyond3d and another interesting slides by Epic's Tim Sweeney
on a side-note, I did not go for the GC in C, but use a more simple refcounter similar to boost's shared/weak pointers with a dedicated allocator.
