Nice. I love URL interfaces (phras.in is another good one). Definitely useful for tutoring over IM.<p>Font looks a bit cartoonish though...<p><a href="http://texify.com/?$\int_a^b\left(\frac{\partial%20L}{\partial%20q}\frac{d\eta}{d\epsilon}+\frac{\partial%20L}{\partial%20\dot{q}}\frac{d\dot{\eta}}{d\epsilon}\right)dt$" rel="nofollow">http://texify.com/?$\int_a^b\left(\frac{\partial%20L}{\parti...</a>