It's been three years since Harry Potter last zipped through our collective consciousness on his rocket-powered broom - sweeping up goblets of gold for author J.K. Rowling in the process.

OK, he hasn't exactly been beneath an invisibility cloak since then. But now, with his latest adventure, Harry Potter and the Order of the Phoenix, set to hit stores at 12:01 a.m. Saturday, Harry is hotter than ever.

What can we expect from Rowling's latest installment in the series? What's new in the Potter sales juggernaut? And how the heck can we remember everything that happened in the first four books, in order to jump into Book Five?

With only hours to go until launch time, we offer our all-inclusive Potter primer, for Harry aficionados and amateurs alike, beginning on 26D.