This comes from an article in Womans Day magazine (Oct, 2010).
sell your crafts on websites: etsy.com; jewelrywonder.com; artfire.com
sell your talent: fiverr.com All talents are $5 each. The site gets $1 and you get $4.
be a nurse on call: fonemed.com
write, edit, proofread: demanstudios.com, associatedcontent.com
design graphics and websites: elance.com
tutor kids or adults: tutor.com
give advice: justanswer.com {this one seems good for your field, to me}
provide customer service: alpineaccess.com, workingsolutions.com, liveops.com
The article also listed a group, scambusters.org that runs down the work-at-home scams.
I've also read locally in my own paper about a lady who started a personal finance management business for seniors. She pays bills, helps with errands, goes over their financial statements with them. This seems like something you could do, as well, given your field.
Other ideas from the article referenced mashupmom.com, blogger.com, wordpress.com. These would be for like starting your own blog. Then go to google.com/adsense or affiliate-program.amazon.com for advertisers.
Another site for small bits of green is swagbucks.com or mturk.com. Swagbucks lets you collect point that you can redeem for stuff and mturk will pay you to complete some little task that they need done like web searching or giving opinions.
Sometimes, you can budget yourself into a better position. It is certainly worth taking the time to get some excel spreadsheets in the works. The other to think about is a part time job that would have hours when your hubby is home to watch the little ones?