[racket] state of math expressions in Scribble?

Hi everyone,

I just wanted to check on what the current state-of-the-art is with
regards to writing math expressions in Scribble.  One of the projects
I'm working on deals quite a bit with algebra: we would like to write
expressions such as the line distance formula in our scribble
documents.  We'd like to have these formulas automatically scribble as
MathML when rendered as HTML, and LaTeX math when rendered as PDF.
Has anyone already done work covering this area yet?