if you don't have experience reading judicial opinions, i would look some up and read them. don't read them to "prepare" for your classes, but read them to familiarize yourself with them and get an idea of what a typical opinion is like. if you are really ambitious you could even start looking up terms you don't understand in a legal dictionary.
another thing I would recommend--highly--is to get a background of the classes you are going to take. E&Es are decent for some, but even better, I think, would be the Understanding series: http://www.amazon.com/Understanding-Cri ... 489&sr=1-2
or this series: http://www.amazon.com/Concepts-Case-Ana ... 567&sr=1-5
They both have books in nearly every subject.
Oh, the concise hornbook series is pretty good too.
The best analogy I have heard (in this great post, actually: http://www.top-law-schools.com/success- ... chool.html
) is that learning the law through a casebook (and classes, for that matter) is like learning a city by being plopped down on one of the streets and walking around to figure it all out. Reading the books I linked to is like studying the map before you're in the streets. Don't outline these books or anything stupid like that, just read through them, maybe jot down some notes, and try to get a sense of what the subject is all about. I promise you that it will only help.
Two other suggestions I have would be to (1) brush up on your economics or read an intro to econ book if you don't have any econ experience (not a text book, but something that will help you understand the simple principles), and (2) read a book on legal writing by Bryan Garner. The Elements of Legal Style, Legal Writing in Plain English, Garner on Language and Writing are all pretty good for this.
People who say you're just wasting your time if you study as an 0L don't have much of a basis for saying that, in my opinion. It's not like something magical happens on day 1 of law school that suddenly makes you able to study the law. You're as smart now as you're going to be on day one of law school (most likely, I guess), and most of the professors that write the intro books are probably better than the professors who will be teaching you next August anyway.