Hello all,

I have a second suggestion for the alt problem that will require the use of 
WAI-ARIA, namely aria-describedby. Drawback: That is currently only valid in 
HTML 5. But it would be the better solution since alternative text and caption 
text are two different things (see also 
http://en.wikipedia.org/wiki/Wikipedia:Alternative_text_for_images).

Using WAI-ARIA the solution would be:

1. If [[File:...|alt=...|...]] is given, use this text for the alt attribute.
2. If no alt text exists, use the “simplified” file name.
3. Add aria-describedby="ImageCaption" to the img tag. (With ImageCaption being 
the id of the caption.)

The screen reader then can associate the caption with the image.

Cheers,
Maria

P.S. Please not that the handling of alt text currently differs depending on 
whether you use thumb, frameless or pixel (see 
http://de.wikipedia.org/wiki/Benutzer:Raymond/alt). It must be consistent.

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