I keep thinking about this site. I want to use it. Unless hit by creative lightning, I don't anticipate using it for Math, but it has great potential in Social Studies. Our art teacher uses it in class as a hook--what a great visual introduction to artists and styles. Much better than a poster or video. It's free unless you want to create and manage student accounts. For 50 ad-free student accounts, it's $29.95 per year. That's not bad--you could use it over and over during the year.
Write it on your communicator: glogster.com.