> Is there an easy way to make ConTeXt use the Concrete Computer Modern
> font for normal text and the AMS Euler font for math -- like in
> Knuth's book "Concrete Mathematics"?

Good noon.

Some time ago I typeset my PhD thesis with Concrete. You may use my way. (AMS 
Euler I don't know, sorry). You need the file font-csc.tex (included in this 
mail). Then you have to declare it in your document like this:
	\setupbodyfont[csc,11pt]
And the Concrete is used. But allas! It's bitmapped font, i.e. you can't use 
in electronic document (it looks awfully).

Many greetings. 
M.K.

P.S. This way of declaring fonts may be stupid. Don't tell it to Mr. Hagen. 
:-)