Trisect an Angle

Ok, here is a slightly more interesting one to further the progression of puzzles we have had here. Given a pencil and a straight edge, trisect a given (acute) angle. This is a classic geometry problem that has resisted the advances of the scale toting geometers for quite some time. Of late, a new and interesting way has been proposed to solve this problem which approaches geometry in a very nice and innovative way. I will post a hint if you guys have much trouble (though going by the other problems I have posted, this seems unlikely..)
Macaulay