There have been a lot of posts in the blogs and on the net about playing D&D with younger kids.
From WotC: http://www.wizards.com/DnD/Article.aspx?x=dnd/4tut/kids2#73004
and this classic article, http://www.wizards.com/dnd/Article.aspx?x=dnd/4news/april2010
Of course there is my kids' group, The DragonSlayers.
Well I am thinking about running some games at Gen Con for kids this year.
I am also thinking of using the Moldvay/Cook versions of Basic and Expert for it as well. Nothing is set in stone yet, I am going to chat about it over the weekend with my regular group. But this might be a chance a debut my long delayed "Return to the Cavern of the Vampire Queen" old school dungeon crawl.
At the moment to make it really old school I need to include more treasure. There is not really enough of that.