Flash cards are an effective study aid because they are founded on the principles of rote and memorization. With Flashcard Exchange | Study Stack and Flashcard Machine, you can use web-based flashcard makers to create, share, export and print flashcards to assist your studying.
FaceTracker is an example of a complex technique that builds on top of a series of computer vision, image processing, and machine learning functions in order to achieve its result. Here's an interview with Kyle McDonald, artist and researcher in New York with a background in computer science and philosophy. He released FaceOSC, a tool for prototyping face-based interaction. Kyle has a growing body of work that uses face tracking in an artistic context, notably Face Substitution.