http://www.homejobstop.com/
It's a work-at-home jobs board. They vet all their posters to make sure the jobs are legit. You're not going to make $5000 a month or retire early on any of these jobs, but you can find 10-30 hour/week jobs for a decent wage. You do have to pay a small fee for "lifetime access" (which I was very nervous about at the time) but it's totally worth it. I found a job on this site in Feb 2009 and have been working at it ever since.
Some of the jobs have regular hours, some are totally flexible. Sales-type jobs are available, but the vast majority are general office-support related work, writing jobs, and some more specialized accounting and industry-specific data entry jobs.
This is the recruiting site for the particular job that I've been doing, but there's lots of other options.
http://www.lionbridge.com/lionbridge/en-US/company/web-si...
You are right to be wary about this process - I was really careful, and took my time to do my research. I was not at all interested in selling anything, and most of the "writing" jobs are initially a lot of work with little return (they can pay off eventually, but I just needed to start earning an hourly wage.) There's a lot of scams, a lot of promises of huge returns, all of which set off loud alarm bells for me.
I started out earning about $500/month, and after a promotion about 9 months ago, I'm now usually earning around $700/month. Like I said, it's not going to turn you into a millionaire, but it sure has filled in some gaps in our financial life. (If you look at the link above and are interested in the specific job I've been doing, feel free to send me a message, I'm happy to talk about it in detail.)
Good luck - you can find good online jobs out there, but you do need to be thorough in your research and wary of scams.