J.F.
I've thought about this a dozen times before, also! We want to help, contribute, use our skills, and yet it's so hard with a little or two in tow.
I think it comes down to organization of it all. Maybe create a FB page in your area that other moms can "like." You can post your ideas, get feedback, and make dates to do something. Maybe find a couple of daycare providers who would help or arrange a rotation of members who watch kids, while the others "work." The problem I've found is that not everyone is comfortable with leaving their kids with someone they don't know....hence why many of SAH.
I was also inspired when I saw an interview with a family that wanted family safe volunteer sites that they could take their kids with. They created a FB page where other charities could post on their site and they organized them all for other families to see and join. Don't remember their site or name.
I try to volunteer to do things that I can work on at home. I've made play - dough for the preschool, organized and put the bulletin board up, and take turns writing the monthly newsletter that goes out to the district. I also make phone calls to ask for guest speakers at the family center.
Where I work also taps into the need for volunteers, and I'd love to have SAHM's who would be willing to help....but it's after school and that's when kids need moms.
GOOD LUCK!!! Let us know what you end up doing.