Very cool replies everyone, thanks!
More and more I'm intuitively leaning towards the idea that there is purpose behind the amnesia. The purpose being to setup the proper rules of "the game" in order to achieve a certain goal. Just now reading the quote by Anagogy, it made me think about Steve and the channeled concept of Polarity he introduced us to.
Perhaps we forget so as to setup this life on earth to allow us to evolve consciously through polarization. By polarizing and moving up the scales of consciousness we are then "given" more wisdom and memory of the afterlife as it becomes less and less important to believe in "the game" and more and more important to be given a broader perspective including what happens in the afterlife.
I think I need to spend some time combining the thinking of Polarization + Scales of Consciousness + the teachings taught in A Course in Miracles. I think there might be some answers in there.
More and more I'm beginning to think that it is not an accident that we forget, but a choice with a purpose behind it.