Cobo Cards: On-line Collaborative Flashcards

"Cobocards are virtually created flashcards. You can print them and study offline, edit them again and again, compare with older versions, check the status of your knowledge, upload pictures and graphs, include formula with LaTeX, share your flashcards with friends, set a deadline for exams,..."

You can create a free account at the Cobocards website, and also watch the guided tour.