I'm gonna use Gunner Training from September-January. Maybe once a week or when I have time to review MS1 concepts and help me review for exams. I love the whole notecard approach, but am usually too lazy to make 'em. Then switch to USLME World or something similar closer to the exam. I've decided to delay clinics one month for the extra study time...so I may have a ridiculous 3 month block to study for boards and finish up my basic science research project and any other pubs before entering clinics.
We started our MS2 material last March (Cardio, Cancer, and Pulmonary Blocks). I'd highly recommend First Aid, Basic Science: Organ Systems if you have a similar block system. It's well organized by disease, has key points of physio, etc. Also, because my school doesn't necessarily teach everything that's on boards...it's nice to study additional relevant material using First Aid Organ Systems WHILE you're taking that block, rather than in 6 months when you're studying for Step 1 and are like...."what's a lung?" Personally, I find regular First Aid useless as it's more in outline form. Good if you like annotating though. Look to your upperclassmen as well for resources. I pretty much pass every exam by studying high-yield TA notes that get handed out every block. AMAZING.