You can use MathJax inside Pollen today. As far as building more integrated support for math typesetting, I'd like to do that, but what I'm not sure about yet are the ergonomics. Ideally, you'd just be able to drop TeX-style math expressions into the markup, indicating whether they're inline or block, and Pollen would do the right thing in terms of handling the rendering (based on whether the output is a web page vs. something else).
How do you think about MathJax vs. pre-rendering formulae to images and using those, with the TeX input as the alt attribute? Oh, and using STIX or whatever as web font.
There is already a couple of packages for Racket that prerenders formulas in TeX into various graphic formats (they call LaTeX to the rendering). It is straightforward to use these from Pollen.
If you want an html-page that works offline, then MathJax is rather large. In that case it makes sense to generate pdfs or svgs containing the formulas. Otherwise using MathJax from a CDN is quite convenient. On mobile rendering a page with many formulas via MathJax is somewhat slow though.
knitr does this reasonably well for letting you drop LaTeX directly into R reports with a delimiter... if you haven't seen that might be worth a look at the interface in some examples (e.g. http://yihui.name/knitr/demo/showcase/)
