Fantastic online tools and resources:

Animoto               Tool for creating videos (30s or less for free)
Aviary                   Photo editing site.
Bubbl.us                Tool for creating concept maps (save often!).
CamStudio            Tool for recording screen shots, animations & tutorials.
Crossword Labs   Create your own crossword puzzle.
Dipity                    Create digital timelines.
Edmodo                Digital classroom network.        
Flickr                     Image database.
FreePlayMusic     Free music database.
GameSalad           Create games and interactive websites.
Getty Images        Image database.
Glogster                Create online, interactive posters
Issuu                      Tool for making online documents interactive.
Jeopardy Labs     Create your own jeopardy game.
Jing                        Tool for recording screen shots, animations and tutorials.
Kerpoof                Create digital media.
LucidChart           Tool for creating diagrams, charts, flowcharts, mind maps, etc.
Masher                 Mix, mash and share video, audio and photos.
Museum Box        Create an online collection of materials.
Nota                     Dynamic whiteboard wiki. 
PicLits                  Create captions or names to accompany intriguing photos.
Pixton                    A tool for creating comics.
PollEverywhere    A tool for polling a crowd via text message.
Prezi                     Create (non-linear) presentations.
Professor Garfield Comics Lab        Create comic strips.
Quizlet                  Tool for creating flashcards.
RedKid.net          Tool for generating signs, images, avatars, etc.
Sam Animation / iCreate  Tool for creating Stop-Go Animations.
Scrapblog            Tool for creating digital stories, scrapbooks, posters and postcards.
Scratch                 Learn MITs programming language.
SpicyNodes         Tool for creating concept maps.  See Example. 
Storybird              Create digital storybooks and postcards.
Tagul                    Tool for creating word clouds.
Tagxedo                Create word clouds.
TimeToast            Create digital timelines.
Vimeo                    Database of videos and tools for video editing.
Wordle                  Tool for creating word clouds.
Zamzar                 File conversion website.