Lange's Case Files, edited by Eugene Toy. Several cases are available in each category.
The cases are arranged by tabs, starting with the presentation. Questions related to the case are posed (answers can be displayed). The approach is discussed, and highlights are extracted as "Clinical Pearls." References and comprehension questions (a self-test) fill out the case.
Lange's Case Files are just a few of the many medical resources available online through the AccessMedicine database. Check them all out.