I discovered a nice use of MathML embedded in SVG today: http://golem.ph.utexas.edu/category/2010/10/test.html
However, when using MathJax (r620) + Chrome (7.0.544.0, OS X), the numbers that are meant to appear in the SVG image (as fractions) all appear on top of each other just above the image. I assume this is due to some kind of positioning issue, perhaps due to position: absolute.
I was using the MathJax userscript from here: http://alexeev.org/display-latex2.html for testing.
I'm sure the author would give permission for one of the images to be extracted as a nice test case.