Listen to boorite. Figure out some service you're good at or enjoy doing and find a way to get people to pay you for that service.
The secretary/accountant at the place I used to work tried out things similar to what you mentioned. They sent her legitimate information about how to earn money by filling out forms and claims and whatnot and contacting people about funds due them and other crap like that.
However, in order to make any money, you had to track down the people and convince them to pay you money for the research you had done. It's a lot of work, and there's little likelihood anyone will pay you for the information you do find.
I told the lady my opinion before she even sent off for the information, but she was the type who liked to talk and seldom listened. She gave up after a couple of weeks.
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This lady was the same one who bought a few of one of our company's most popular products (at wholesale price, of course) and tried auctioning said product on eBay. Even though it was a popular product with a low price point, she sold exactly zero of them online.
The problem was that no one really knew this product existed outside of the retail businesses to which we sold it. People who saw it in those specialty retail shops bought it on sight (and site) and thus would never need to look for one online. It wasn't a common item that anyone would search for on eBay, either.
Again, I tried telling her these things to no avail. I also mentioned that her scheme was ethically questionable because she would be competing with her own company for sales, but we'll just say ethics was not something that concerned her. I think she eventually sold the pieces back to the company for the price she had originally paid, so at least she didn't lose any money on the deal.
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If you really need an extra $100 a month, cut back on whatever expenses possible. After I lost my job and became a stay at home Dad, certain things became extraneous. We reduced our cable bill $30 by getting rid of digital cable. I switched to a cheaper ISP and saved $15 a month. I told BellSouth to suck the big one and signed up with a new company which provides a better level of service for about half the cost. Every little bit adds up.
The data entry things you mentioned sound a bit more legit than stuffing envelopes, but there's a good reason those companies outsource that type of work, and it's not because it's expensive for them.
