I've just come across ASCIIMathML. It's superb!

`e^(ipi)=-1`

`mu = E(X) = sum_x.x*P(X = x)`

`sigma^2 = V(X) = sum_x.(x-E(X))^2`

Update: there appears to be a bug in Chrome's rendering of these formulae in that the first `x`s should appear under the `sum` signs, not after them. I've added some '.'s to make the meaning clearer for Chrome users.