Here is a video of the "bore cut":

http://www.youtube.com/watch?v=UZLBtFdmKKU&feature=related


Here is another video showing an interesting technique for directional felling, and possibly could be adapted into a new way to cut tenons?

http://www.youtube.com/user/Ekka007#p/u/27/BLkgWFh9lDs