Most word cloud programs work in the same, straight-forward way; the more a word is used in the text, the bigger it is shown in the cloud. A glance at a cloud is an easy way to preview a passage, or to analyze text.
gClassFolders is a tool that allows for management of all the files that students share with teachers and allows for sharing easily with students. The setup is straight forward and sets up three folders for students for a class - Edit, Preview(Read Only) and Dropbox to turn work in. If your school can't afford Hapara or you don't want to spend lots of time setting up folders, this may be the tool for you.
A good e-book search engine. Search for lots of formats including PDFs and Doc files. Preview books and embed some into your website.
http://ictmagic.wikispaces.com/English
Free online business articles and news at Harvard Business Review. Read a preview of Which Kind of Collaboration Is Right for You?, by Gary P. Pisano, Roberto Verganti.
Here are all the RSA animate lectures that have been done including Dan Pink's and more. Excellent and fun resource for teachers. Those teaching elementary age should preview the images being drawn before showing in case of sensitivity to certain imagery.
Some great free maths worksheets on this 'paid for' site. Additional resources can be found when you press the 'preview' link.
http://ictmagic.wikispaces.com/Maths
Excellent podcast series to learn about the "history of white people" and how race was actively constructed to create our current context. Thanks to Gwen at the Drury Lane Bookstore in Grand Marais for turning me on to this! Very accessible -- although trigger warning content is very disturbing. Preview if you teach younger students.
"Let's start by agreeing that scaffolding a lesson and differentiating instruction are two different things. Scaffolding is breaking up the learning into chunks and then providing a tool, or structure, with each chunk. When scaffolding reading, for example, you might preview the text and discuss key vocabulary, or chunk the text and read and discuss as you go. With differentiation, you may give a child an entirely different piece of text to read, you might shorten the text or alter it, and you may modify the writing assignment that follows."