Moms are incredibly active on the web. All you need to do is get in with the "Mommy Blogger" crowd, which is quite large and influential, and tends towards activism.
iVillage is filled with moms, as are wahm message boards, etc., etc. Your audience is there, and they want what you've got, I'm sure.
You're totally right, and I appreciate the encouragement actually.
I'm really not the world's most phenomenal marketer or community organizer. It takes a lot of those two competencies to be successful in a social application endeavor. :/
I actually set up a slinkset site, http://www.bababase.com, a few months ago based on the very premise we're discussing, but I've had a tough time finding a way to get traction amongst a non-nerd crowd! (Moms, in this case.)