Photopeach - Free slideshow creator
Google Earth - Lets you fly anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings, from galaxies in outer space to the canyons of the ocean.
Khan Academy - Learn almost anything, forever! (free)
Wordle - Free "word cloud" generator
Quizlet - free study tool (especially good for flashcards)
"Every child is gifted, they just unwrap their packages at different times." - unknown