Having just sold my entire collection of hornbooks, commercial outlines, and other study paraphernalia to one of my former LSAT students, I thought it might be worthwhile for those in the know to dispense some advice regarding the feast of materials available at your law school bookstore. Though there is no replacement for regular class attendance, dedicated study time, and frequent ingestion of Adderall, I would recommend the following for anyone who gets stuck:
Aspen's Examples & Explanations Series. These are about as close to Law for Dummies as you're going to get. They aren't completely stripped down and useless like the majority of commercial outlines. Instead, they leave out cases (for the most part) and focus on giving you a step-by-step explanation of the law. The Glannon volumes on Torts and CivPro are particularly badass.
For Contracts: Farnsworth on Contracts. Don't buy it, because it's huge and you'll never read the whole thing. But when a particular phrase like 'promissory estoppel' or 'inflatable twinkie' makes you cringe, find Farnsworth in the library and he'll ease your pain.
For ConLaw: Erwin Chemerinsky's Constitutional Law: Principles and Policies is voonderful. I have several close friends whose lockers had Chemerinsky's face plastered on the inside. If ConLaw makes you cry, Erwin will make you cry less.
For Property: Quick! Your great-great grandmother just died, leaving her entire PEZ collection to your third male grandchild, but only if he agrees to become a radish farmer. Can she do that? I don't know, but you probably will after checking out this book from John Makdisi. It's got a ton of problems to help you review estates and future interests, and is solely responsible for me getting a D+ instead of a D in Property.
Everything Else: Is crap, in my opinion. But I'm sure that plenty of other folks with much higher GPA's have much better opinions. So feel free to add your thoughts. This is for posterity.