D's shiny new opCall overload gave me a chance to improve the interface of my printf-workalike.

import formatter;

/*
 * the trailing () is needed to convert the formatter object to a
 * string, since implicit conversions are not possible
 */
char[] result = format("{0} + {1} = {2}") (5) (2) ("Spam") ();

You can grab it at http://ikagames.com/andy/d/console-19-sep-2003.zip