Meta-notices for this:

(just for me to keep track)


 - http://meta.physics.stackexchange.com/questions/1233/math-and-si-formatting-buttons
 - http://meta.chemistry.stackexchange.com/questions/70/mathjax-formatting-buttons-for-you
 - http://meta.math.stackexchange.com/questions/4111/mathjax-formatting-buttons-for-you-guys
 - http://meta.electronics.stackexchange.com/questions/1106/mathjax-hotkeys-script-for-chrome-and-firefoxgreasemonkey
 - http://meta.quant.stackexchange.com/questions/297/mathjax-hotkeys-for-chome-and-firefox