The 6 Seconds ECG Simulator -- Quickly learn to identify 27 of the most common ECG rhythms or challenge yourself to the Six Second ECG game
ECG Learning Center -- Contains hundreds of ECG diagrams and rhythem strips. Most of the 12- and 6-lead ECGs were recorded at LDS Hospital in Salt Lake City, Utah. Each of the ECGs has an interpretation and many have additional explanations that help explain the diagnosis.
ECG Library -- This library is a collection of realistic looking recordings which will help improve your ECG skills.
Lynch, P. J., & Jaffe, C. C. (2006). Cardiac anatomy 2, oblique_heart Yale University: Yale University.