Is the VSE multi-threaded? So I am thinking of doing an AMD build with the fx-8370 and want to use Blender's video editing component for video editing but I do not know if it will utilize all eight cores. 

Should I look to some other video editing software to utilize all eight cores for video editing or will Blender do it?
From my own experience with Blender 2.72, even if it is threaded, it is not very good at utilizing more than 2 cores.

I've also done some benchmark on sequencer performance here: Render times for standard non-3d video.