Teaching English Abroad - There are many programs that will pay you to go into other countries to talk in English. Of course they require some type of certification. This is a great side job for recent high school and college graduates who don't have any job or life restrictions. I know of at least 2 of my college buddy's who went directly to Japan after graduation for a few months and loved the experience. If you have every wanted to live in or visit other exotic country's then this is the side job for you. Here is "Laura Mann" feedback for teaching in Japan.

Teach courses at your local community center or adult school - There are tons of classes that are offered in your community and adult schools, you should look to see what is offered and find something that interests you. This is a great side jobs for teachers because they most likely already have all the proper credentials. This is a brief video on how to start your own class at the Learning Annex.

Tutor - Tutors are always needed. Math tutors, English tutors, Chess tutors, you name it they need a tutor for it. Do you know how to program in C++, well someone out there has a homework assignment they need help with. Know the difference between a proton and a neutron, some of us don't and could use a tutor. I recommend going to CraigsList.org, click on the "jobs" link and then do a search for "Tutors". If you like to help others and make some extra cash then this is the side job idea for you.

Cut lawns and landscaping - Sometimes the best side job for you is dictated by the tools you have in your garage. Do you have a lawn mower, shovels, a large straw hat, then you could have a side job cutting lawns and/or landscaping. If your willing to do some hard labor on the weekends then you can make some cash to buy an even larger straw hat. I suggest starting local, ask your neighbors and post flyers. If you do a great job they will recommend you to their friends and your side job will boom.