Eli Barzilay wrote:
Using images sound like the usual fragile solution, so ideally there will be some better solution for both latex/pdf and html in the future. (But it's been more than a decade that math-in-a-browser is "just around the corner".)
There's MathJax (http://www.mathjax.org) which accepts LaTeX (yes, and \newcommand) or MathML as input and can render images, MathML, or HTML-CSS based on browser support and user preferences. It supports copy and paste into LaTeX files and any program that supports MathML like MathType or Mathematica. Apparently, though, people think that the API isn't robust enough yet for Web application support.
MathML is important to support because applications like screen readers can use it, but it's a very good way of representing math statically. Unfortunately, math typesetting support is a fairly low priority for most applications since few people want it and it involves writing nontrivial code (like a TeX parser).
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