I usually post about science education, but I know some of my readers teach multiple subjects. I took one of these free, online courses with Waynesburg University several years ago in order to improve my ability to help all subject areas with content-area literacy. These courses help teachers locate primary sources from the online holdings of the Library of Congress and other sites, and show you all kinds of tools for using them to do inquiry (primarily in social studies). It was excellent. There’s a new one coming up, and I highly recommend anyone who teaches history or social studies give it a try.