Personally, I learned best by doing questions as opposed to passive reading. So for the past few months, I would make my own questions based on topics which seemed salient to me as testable material. So while reviewing journal articles, Cuccurullo (Board Review), PM&R Knowledge Now, Emedicine.com, etc, I happened to collect a few hundred questions over time. Initially, this question collection was just for me, but I decided to share it with other residents in my program. The feedback was great in helping us study for SAE exams. So I figured, why not use my web development experience and share this resource nationally. Particularly because there are so few question banks available.
Understandably, the question of validity arises. Yes, the site is young, but each question is linked to an online resource about the topic in question. This allows each user to immediately review the question and read more on the topic.
Current users have commented that the more interactive way of studying was more convenient and promoted a more comprehensive learning experience.