Create electronic presentations completely on the Web. Similar to Powerpoint. Zoho Show can import and export Powerpoint, as well as embed a slideshow onto your Web site or blog.
This is a great video to show students about Wikipedia. It does not discredit the site entirely but explains that people can revise information. Also, it is a good general video for navigating Internet information.
Shelfari is a social networking page where you can create a virtual shelf to show off your books. Next year I am going to make one for each class and give each class login information so we can track what we read!
A FANTASTIC resource for students (and teachers!), Wordnik allows you to search for a word and then shows its definition, example sentences/uses, etymology, pronunciation, tweets with the word, and photos from Flickr that are related... wonderful for all learning styles.
Animoto videos--music videos for your images and pictures. With high production value motion graphics synchronized to every beat of your music, Animoto videos blow the doors off traditional slideshows.