My favorite links:
Kevin Coombes's Prime Numbers webpage
Higher Dimensional Lattices by David Canright, from the Tuning Digest
Sacred Geometry and the Evolution of Consciousness, by Tom Kenyon
Visual Access
Strategies for Multi-Dimensional Objects and Issues,
by Heiner Benking
The Human Information Processing System - HIPS
Corporeal Meadows, the Harry Partch website
MIMI and the Illuminati: Notes, mathematics and "visual music" in performance
Music and the Physical Universe, by Tony Smith
SamF's Music Page (with some great diagrams of ratios)
Complexity and Beauty in Music: Some Complications, by Trevor Wishart
Musical Theory and Ancient Cosmology, by Ernest McClain
Robert Asmussen's dissertation Periodicity of sinusoidal frequencies as a basis for the analysis of Baroque and Classical harmony: a computer based study
The Peace Pledge Union for Nonviolence
THC to tar ratios in waterpipes, joints, and vaporizers
Links to info on Drugs
If you don't understand any of my music theory, start here.