For current topics, study back issues of Planning magazine, at least those going back for a few years. Also check up on the new urbanism and smart growth Web sites.
My study plan was fairly simple -- a couple of second-hand AICP study guides and browsing the Green Book for a couple of weeks, then a hotel room at the exam site the night before, with a final read-through of all the exam guides, cover to cover. Get eight hours of sleep, and a full breakfast over a newspaper and a couple of cups of decaf. Don't do any studying the morning of the exam. Stay away from those cramming in the exam room, or quizzing each other -- if you hear anyone say "Burnham," "Riverside," "Radburn," "Ambler versus Euclid" or "arbitrage", just stay away.
BTW, stats. Yes, there's a lot of statistics questions, but they're not as esoteric as you would think they are. They do go beyond mean, median, and mode, but there's no need to memorize any long equations. Ethics questions aren't horrific brain-busters; most seemed like common sense, and didn't require esoteric on-the-fly interpretations of a memorized AICP Code of Ethics.
I'll never be an AICP geek, per se, but I did good on the exam, and now have those coveted four letters on my Planning magazine mailing label. The giddy feeling wears off after a couple of months, and you eventually regret getting "AICP" printed on your checks and your driver's license.
Don't forget that AICP also stands for:
Association of Independent Commercial Producers
Association of Islamic Charitable Projects
American International Concession Products
Association of Insurance Compliance Professionals
American Institute of Collaborative Professionals
AIDS Insurance Continuation Program