Do you recommend any sites to help put you in touch with these SAHMs, or just Craigslist?

I'll take a personal introduction over Craigslist any day of the week. Your relationship is more likely to convert to actually receiving work (people are, on average, flakes), it will last longer, and on average you'll get better work done.

You almost have to be a fascist with posting writing jobs on Craigslist because any solicitation will receive hundreds of applications, many of whom having writing skills that would be overpriced at "free". You spend as much time weeding through solicitations as managing your relationship with the people actually contributing useful work.

That said, some SEO buddies of mine have had success with Craigslist.

I've been working on such a site for the past week, which is why posed the original question.

oh, kinda like one of those ads: google pays $100/hour to stay at home mom for online work, no experience required.