BlendedSchools/Blackboard
You can set up your class so that your students can use the StudyMate server within Blackboard.com to create flashcards and other activities to help with the memorization of content.

Here are some other online apps to develop study guides and activities for students to help them study:

FlashCardMachine Free service for creating interactive web-based study flashcards that can be shared with others. Can attach photographs and pictures to your flashcards.

Study Blue Social networking site allows high school students to create study activities by subject, and then invite friends to participate. They also have access to the notes and study activities created by students around the world.

Quizlet http://www.quizlet.com

Flash Card Exchange http://www.flashcardexchange.com/

Study Stack http://www.studystack.com/

Flashcard Machine http://www.flashcardmachine.com

Ediscio http://www.ediscio.com

Quia Quia offers a free 30 day trial. You can make flashcards here , or other games, too.