Moms with young children are always sought after for surveys. When I was single or newly married, survey companies couldn't care less about me. I'd get offers once or twice a year (really!) But since I became a mother, I've hit the motherload....literally.
Another reliable one to consider if you have young kids is mysurvey.com.
There are also many reliable market research companies that conduct panels, taste tests, and product testing. Most of these pay in cash. I'm putting together a local list of companies that routinely send me legitimate market research opportunities and will be posting it soon.