The Amiri font is as beautiful as ever and, we have implemented it in tranlatewiki.net as an experiment because the latest developments in the browsers' Unicode compliance is improving the rendering substantially. An Arabic text showing the Amiri font can be found here and the source looks like this:
<div lang="arb" class="mw-content-rtl" style="font-size: xx-large">
* بسم الله الرحمن الرحيم
* حررد مييسن
|the Amiri font with the Firefox nightly build|
When you look at it with the nightly Firefox build it looks good. With production browsers the quality is still lacking. A MediaWiki solution will not only make a difference for the Amiri font, it will also make a difference for the Arabic font provided with Windows XP. Such a solution requires expertise in the inner workings of the MediaWiki parser and Unicode.