AMD at SIGGRAPH
AMD's developer technology team will host a Tech Talk presentation at Siggraph on the future of their GPU-accelerated rendering solutions.
ZBrush SIGGRAPH 2013 Recap
Here is a massive recap of ZBrush's presentations from Siggraph 2013.
Pixologic - SIGGRAPH 2012 Recap Video Series
Browse through this recap of Pixologic's video demonstrations from this year's Siggraph convention.