[…]
I don't know if something changed, but this has stoopped working.

\setuppapersize[A5]
\starttext
\dorecurse{10}{\input knuth \endgraf}
\stoptext

With MkII I get

$pdfinfo page-test.pdf
Title:          page-test
Subject:
Keywords:
Author:
Creator:        ConTeXt - 2011.02.25 22:03
Producer:       pdfTeX-1.40.11
CreationDate:   Sat Mar 19 13:50:49 2011
ModDate:        ConTeXt - 2011.02.25 22:03
Tagged:         no
Pages:          5
Encrypted:      no
Page size:      595.276 x 841.89 pts (A4)
File size:      33436 bytes
Optimized:      no
PDF version:    1.5

With MkIV:

$pdfinfo page-test.pdf Title:          page-test
Creator:        ConTeXt - 2011.02.25 22:03
Producer:       LuaTeX-0.65.0
CreationDate:   Sat Mar 19 13:53:29 2011
ModDate:        Sat Mar 19 13:53:29 2011
Tagged:         no
Pages:          5
Encrypted:      no
Page size:      595.276 x 841.89 pts (A4)
File size:      16057 bytes
Optimized:      no
PDF version:    1.6

Notice that the page size is still A4! Any idea why this is happening?
(I get the right paper size with letter, A0, A1, A2, A3, but wrong paper sizes with anything smaller than A4).

Aditya
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