This is what has worked for me...
1. Get yourself a Palm (Sony, Ipaq, whatever)
2. Get the following programs: 5-Minute Clinical Consult, a dictionary (Stedman's is big but great, Taber's is more concise), strongly consider Outlines in Clinical Medicine, and E-Pocrates.
3. On every patient you have, hear about, etc., use these programs to learn the following: a basic summary of the disease, important signs and symptoms, how you diagnose it, how you treat it... (5-Minute Clinical Consult format). Make a notecard or cheat sheet with a quick and dirty summary of these. I have really found this helps for those "what to do next questions" because that's how you learn it.
4. In addition, use your memopad on the palm to jot down notes and pearls that you think is useful.
5. This prepares you fairly well to do quite a bit of learning when unable to actually sit down and study, and it also reinforces your learning by looking up the information right away!
6. When your day is done, or when you have free time with computer access, go to uptodate.com or emedicine.com and look up some of the biggest topics (i.e. Heart Disease for Medicine, Acute Abdomen for Surgery, Preeclampsia for OB/GYN) and print these off to read. These will also have good information for what to do next and are great ways of providing the most up-to-date information for impressing your residents/attendings.
7. The only studying I would do besides this is to do lots and lots of questions... Pretest, Appleton and Lange, or NMS are usually decent. I then use my palm programs or review book to look up topics I seem particularly weak in.
Essentially, I try and do most of my studying by learning on the go. I then check what I've learned by doing the questions. I really find it much easier to use the palm and online sources than to use the large textbooks, which take forever to search and read. Learning as I go also allows me to have more goof off/sleep time, which is also much appreciated!
Well, I hope that helps... Let me know if you have any questions about my odd studying habits!