WordPress has supported \textrm{\LaTeX{}}, on both wordpress.com and as a plugin for a couple of years. You can adjust the size and style of the output and enable it for comments, which, if discussing mathematical formulae with peers, could be of huge benefit. To use \textrm{\LaTeX{}} on your blog, just activate the wp-latex plugin.

Maxwell’s Equations

\nabla \cdot \mathbf{D} = \rho_f

\nabla \cdot \mathbf{B} = 0

\nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}} {\partial t}

\nabla \times \mathbf{H} = \mathbf{J}_f + \frac{\partial \mathbf{D}} {\partial t}