This is a gush. I am probably one of the few people in the world really, really excited about MathML fonts!
For those into mathematics in general and MathML in particular, and getting it into e-books and print; a giant leap forward has been taken with the announcement on the 28th May 2010 (a day I was not sure would ever arrive); STIX fonts Ver 1 has been released. We have been using the mysterious, hard to find betas for what seem forever, but birthdays do arrive.
My/our/world's deepest gratitude (I think that is the best word) to the STIX team for completing this Herculean job. 10 years seems a long wait, but now the wait is over. The crowning glory is the MathML using/rendering technology is poised, ready, available and usable to exploit the font work to its fullest.
The magnificent (the hinting and presentation MathML are stunning) STIX FONTS are released under the generous SIL license.
Their timing is fantastic for Infogrid Pacific as we are about to launch the MathML module for IGP:FLIP (previously using STIX betas of course). This leans heavily into the Open Source community with FireMath as the MathML editor (and a brilliant job that does), the STIX Fonts, and Python SVGMath to get it into printable and e-Book presentation format. We also have to say thank you to the Mozilla team for having the foresight to do such complete work on MathML so early and now supporting MathML3 when it is needed most. You stand alone.
That means you lucky publishers of print, e-book and online web resources; You will be able to create, maintain, generate and publish your MathML using IGP:FLIP. However you will have to use Firefox as your browser - which is hardly a punishment brilliant as it is.
I general adopt a cynical tone, I do critical stuff, not gush. Sorry, had to this time. Having played with MathML for a decade and repeatedly given up in frustration, this is a major, major event in the world of XML content. NO MISSING GLYPHS!
And yes, you can embed the STIX fonts into your ePub, but your Math is highly unlikely to display. It takes a decade of dedication to make MathML play nicely.