Tech&Learning is a great resource for educators. It is a print/online magazine, along with a great website. They also produce TechForum educational conferences (great for all educators) and Virtual TechForum.
The Tech&Learning magazine, available free to qualified educators, is released monthly and contains articles, tips, resources, product reviews, and much more.
They have just announced a new endeavor: Tech&Learning University, which provides online Professional Development to K-12 educators. Courses are on-demand and focus on topics such as Educational Technology, Effective Instruction, Educational Leadership and much more.
It is not free, but is a great option for teachers looking for PD opportunities. The site to get started is http://www1.kdsi.org/TL%20. You start by selecting your state and then it will show you the courses available. What is really nice is that many of the courses are authorized for CEU's in your state, as well as college credits. Many other sources of PD do not actually count towards CEU requirements for many states.
Check it out, explore the course offerings for your state.