There are things like that out there for all sorts of things... but usually you can really only see real money from it if you spend hours and hours and hours doing it. Then there are people all over the word that do these things for literally pennies per thing done.
-Online reviews
-Typing in numbers on those blurred images for new accounts
-Looking at ads
-Farming for gold on everquest, WoW, etc.
Other things are cool if you actually find legit ones. I'd say try looking for secret shopper companies... you'll go into a store with a task of doing something. Big corporations spy on each other all the time to understand the experience, pricing, marketing influences, etc. In the end you usually end up with free stuff or gift cards.
I used to work for a company that did surveys, one of them was a product testing group called Marie Brighton (sp?) they'd send pools of people all types of weird things, cat food, pasta sauces, beta drinks, etc. The most fun one was the glad disposable tupper ware containers... they were trying to test the lightest density of plastic you'd put up with. (melting, staining, smelling, etc)
Good luck with the riches,
Nate