On Thu, 10 Jul 2008 06:02:09 -0700 (PDT), wrote:

I have a brick house and need to repair some mortar around the windows
that has fallen out of the top corners. Does anybody have a good idea
how to match the color of new mortar with mortar that has been
weathering for 40 years? I don't want the repair job to be glaringly
obvious.

You might try http://www.i-boards.com/bnp/wc/default.asp

Mostly about interior stuff ("walls and ceilings"), but they know their
stuff.