Chapter 24. That's roughly the point at which part one of "Harry Potter and the Deathly Hallows" will end.
Ever since it was first revealed that the big screen adaptation of "Deathly Hallows" would be split into two parts, fans have been guessing at exactly where the break would fall. No need to wonder anymore though. "Potter" fansite Muggle Net got an early peek at an upcoming issue of Entertainment Weekly, which says that the split happens "at about Chapter 24 of the book, with Voldemort gaining possession of the Elder Wand, one of the three Deathly Hallows that allow the bearer to conquer death."
Now all that's really left for fans to do is wait. Part one of "Deathly Hallows" arrives later this year, on November 19. The series concludes the following summer, on July 15, 2011.