I've started work on a project to put samples from the Bible in many languages on our Vision 2025 website. So I've got to get to grips with some Unicode issues. Working out what browsers will display what you want is a bit of a minefield. It's also a question of which fonts your website visitors have installed, which partly depends on which Microsoft products they have installed, which you can't autodetect.
The wisdom seems to also be that people won't install fonts just to read something, though we'll offer them that choice.
Apache Server Side Include (SSI) files only import ASCII. I think someone needs to read Joel on Software The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!).