Like Dar, I'm a single mom with no outside support, I've been hsing ds for 1 year now. I work as a bartender, I can make lots of tips in a short period of time (I work about 6 nights a month), and the job is not absorbing enough to use up a lot of my mental energy. I've tried doing other jobs, but for me, I've found that anything that requires any mental effort on my part, takes away from the energy I have left for ds. My current job is very fun, very flexible, and I love the fact that for at least one night a week, I get away from parenting/hsing altogether (it's a very youth oriented private techno club, totally different from my daily life.)
So far this has worked for me. I think the absolute most important thing I need from a job is total flexibility (if I can't show up for work because the babysitter has flaked out or ds is sick, nobody is going to be really affected by it, and my manager is very understanding of my schedule, I always get first pick of shifts.)
We're also unschoolers, so I don't "teach" anything, technically, so if my schedule changes suddenly, we can deal with it. I'm around during the afternoon and evening when ds is at his most active, a day job would be absolutely horrible for both of us.
Come to think of it, most of the hsing moms I know around here work part-time. Some of us need to, others need the outlet, others want to keep one foot in their career. It seems to be working for quite a few people.