If this has been asked before, my apologies.

Is there a style file for formatting PDFs from ConTeXt for reading on an iPad?  So far I've just used 

\setuppapersize[A4][A4]
\setuplayout[backspace=20mm,
width=160mm,
topspace=20mm, top=0mm,
header=0mm, footer=10mm,
        bottomspace=20mm,bottom=0mm,
textheight=250mm]

which works fine - for printing - but isn't optimized for the iPad.  If anybody has any suggestions or examples, I'd be very grateful of them!

Thanks,
Alasdair

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