The world learns on Quizlet.They've made a simple tool that lets you study anything, for free.
Teacher's Link: http://quizlet.com/teachers/Teachers can choose from ENGLISH, MATH, SCIENCE, LANGUAGES, and SOCIAL SCIENCES - WOW!!
Learn anything your own way: There are 6 different study modes
Flashcards: Flip through and familiarize yourself with the material.
Learn Mode: Track your progress and review the things you got wrong.
Scatter: Match words to their definitions and try to finish faster than your friends.
Speller: Type what you hear. It works in 18 different languages.
Test: Prepare for the actual test with an automatically graded quiz.
Space Race: Earn points by typing in words before their definitions vanish off the screen.
Study with friends: It's a great way to work together
Join a class: Find your classes to share and learn together.
In the classroom:Quizlet is great in the classroom, for individual study or group exercises.
Friendly Competition: Show off your scores — and your knowledge.
Check out the QUIZLET DEMO and QUIZLET TUTORIAL