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> It's almost impossible to get PNGs well-aligned with text,
> one reason being that TeX doesn't tell us where is base line ($a^i$ and
$a_i$
> may have the same height, but they should be treated differently).

The idea is not to get it aligned with text, the idea is to get it roughly
the same size as text. <math>\mathbf{F}=ma</math> should look roughly the
same as '''F''' = ''ma''. At the moment even formulas on their own line look
ugly, because they are too big relative to the text of the article. I
recognise that different browsers/people use different font sizes, and
therefore have different ideas of how big formulas should be, but I think
the *default* sizes of PNGs should reflect the most common browser
configuration, not just whatever it was set to by the authors of TeX.

-- Tim Starling.