Please add LaTeX rendering to writeups for less pain when creating math writeups. Recently, it has become much easier to do add such functionality to sites thanks to MathJax. (We probably don't need a GUI; most users who intend to use it probably already know LaTeX)
For an example of math writeup pain, see Fourier Transform. Chris essentially had to paste/bold every symbol and he still couldn't get integrals or square roots to render. Nails on a blackboard I tell you. Nails on a blackboard...