Singapore Math is the non-computerized elementary math curriculum I have seen mentioned most often on this forum, is what I have used with success with two of my boys, and is used by at least one gifted school, ANOVA http://www.anovaschool.org/index.php?option=com_content&view=article&id=56&Itemid=65 .

"To see what is in front of one's nose needs a constant struggle." - George Orwell