You beat me to it. For those who don't know:

http://tauday.com/

Happy Half Tau Day to you too http://halftauday.com/

That's shaken my very comprehension of the universe. Or rather, very much heightened my intuition of algebraic geometry. What on earth are we wasting our time with pi for!?

From the Pi manifesto[0]:

Unfortunately, the Tao Manifesto is full of selective bias in order to convince readers of the benefits of τ over π. They pinpoint formulas that contain 2π while ignoring other formulas that do not.

[0] http://www.thepimanifesto.com/

Pi Manifesto rebutted: http://tauday.com/tau-manifesto#sec-the_pi_manifesto_a_rebut...