For conductors of research
There are a lot of great tools on the web that are underutilized by psychology researchers. I have posted just two for now but plan to add more as I find and collect them. There are a lot of great sources of data and data collection out there that researchers can take advantage of. If you've got a great site or tool that others would benefit from knowing about, feel free to contact me and I may add it!
If you need answers to a very small number of questions, this could be a great tool to get answers quickly and cheaply. Asking people a single question starts at 10 cents per response, while asking 2-10 questions jumps the price per complete response up to ~$1-3. If you are looking for a some quick insights, maybe a between-subjects test of how two differently worded questions might affect responses, this may be a great tool to try out.
This data collection site is great for piloting surveys, completing class projects, and getting responses from motivated survey-takers. It is completely free, and the number of people you get will depend on how long your survey takes and how interesting it sounds. Since people are taking it just because they are interested, there is less worry about people rushing through for credit. Instead, you have people who take a lot of surveys giving you feedback on your questions, which is why it is so useful for pilot testing especially. People here will point out mistakes you made, which is very helpful!
For consumers of research
Psychology research can present interesting findings about people as a whole, but it's often hard to know how it will apply to YOU. If a study finds that 70% of people react a certain way to a situation and 30% react another way, that doesn't tell you anything about which group you would fall into. Below I've posted some cool sites that allow you to learn more about yourself while contributing to scientific knowledge as a whole.
This site has tons of surveys about morality and related areas. After registering with some basic information about yourself, you can take any surveys you are interested in. After each survey, you will get automated feedback on your responses, how they compare to others, and where you can learn more about what was being studied.
Similar to Your Morals, Beyond the Purchase allows you to take surveys after registering and receive feedback based on your responses. These are more geared towards happiness and satisfaction and how the relate to your spending habits. You may learn quite a bit about what does (and does not) make you happy, as well as receive tips for improving your happiness and satisfaction.