What is this mountain bike?
As people already mentioned in the comments, it's old good Kona Stinky. For me this is a symbolic bike, Paul Bassagotia, one of the pioneers of the freeride scene, used to ride on it before moving to Scott. You can find more detail on specs it had here: http://www.konabikeworld.com/08_stinky_w.htm

And here we can see Kona's older catalogue, including older Stinkies http://www.konabikeworld.com/tech/catalog/catalog_2k4.htm