>> I also don't know what exactly to do to fully support the three 
>> special letters (and their uppercase equvalent) č,š,ž,Č,Š,Ž 
>> (\v{c},\v{s},\v{z}, ...). In 'cont-usr.tex' I simply copied
>> \installlanguage [\s!sl] [\s!mapping={il2,ec},\s!encoding={il2,ec}]
>> although I have no idea if it is correct or not.
> 
> i huess it is
> 
>> In LaTeX I use \usepackage[cp1250]{inputenc} (or latin2 or utf8, 
>> depending on the operating system and editor), but \useencoding and/or 
>> translate=cp1250cz in ConTeXt seem to have no effect (they do work for 
>> German äöü, but not for our strange signs).
> 
> 
> i think that latin 2 is il2, so
> \enableregime[latin] should work, but best ask advice to czech users

Hi Mojca,

czech users use CS fonts (Czech Computer Modern) from Petr Olsak. They 
are in latin2=il2 encoding and low 7 bits are identical with original 
Knuth's Computer Modern.

1. Setting in Context is in cont-cz.tex and important line is
      \setupbodyfont [csr,ams,rm,12pt]

    CS fonts are part of TeX Live.
2. If you use editor with encoding in cp1250 write
      % -translate-file=cp1250cs
    at very first document line.
    (Perhaps it is not the best solution in ConTeX, perhaps
     \enableregime[] ??)

For using CS Times etc. I created some quick patch. See attachement.
Perhaps, it will help you.

Vit Zyka