Online Master's Degrees in Education
If you already have a bachelor's degree in education, you can increase your expertise and salary expectations by getting a master's degree in the field. According to Wikipedia, this degree is necessary for licensure in some states, such as New York and Massachusetts. It is also a necessity if you aspire to being a school principal.
Getting this degree online can have many advantages for teachers looking to further their credentials. For one thing, if you are already working as a teacher or teacher's assistant, you don't have to take out two years from your working life and incur the opportunity cost of two years of a teacher's salary. Instead, you can take your classes online in the evenings and on weekends, on your own schedule. The same applies if you are working at another job and hope to transition into teaching with your new degree. An online degree is generally also less expensive than a traditional master's degree.
If you are interested in pursuing this degree, here are some programs to look at. Western Governors University offers many varieties of the master's in education, targeted at different disciplines and age levels. For instance, if you want to teach science, you could get an M.A. in Science Education for Physics, Geosciences, Biological Sciences or Chemistry. The M.S. in Special Education is a popular degree, as schools devote more of their budgets to serving special needs students. Keep in mind that all of these advanced programs are for already-licensed teachers, though Western Governor also offers online teacher licensure programs. These incorporate online education with experience in a classroom, which for novice teachers can be much more of a learning experience than anything they would encounter online.
Columbia College of Missouri, ranked as one of America's best colleges by U.S. News, offers a Masters of Teaching degree online. This MAT degree requires you to take foundation courses in curriculum design, as well as support courses in critical & creative problem solving, analysis & correction of reading disabilities, and technology in education. At only $320 per credit hour, this program will be affordable for many.
Finally, Oregon State offers a Master's in Education (Ed.M.) for licensed K-12 teachers hoping to increase their range of networking opportunities and learn how to incorporate research into the teaching process. The program accepts students and employs expert teachers from many countries around the world, including Syria, South Korea and Taiwan, so it would be an excellent choice if you think that an international teaching position may be in your future.
Make sure that any program you choose is licensed by the National Council for Accreditation of Teacher Education (NCATE), since you want your degree to carry currency and respectability within the teaching profession.