I often get asked about questions regarding the size and development of the human brain in the evolutionary context, and I have a hard time remembering the material on allometry and what not that I've read here and there.
1 But
The Journal of Human Evolution has a nice paper up,
Human encephalization and developmental timing, which I've put up as a PDF in the
GNXP forum files as "encephalization."
1 - My primary source in
The Symbolic Species, though I've read other stuff in the literature....