We hear from the folks over at the Leaky Cauldron that Warner Bros. is releasing a new trailer for “Harry Potter and the Half-Blood Prince” tomorrow. So while we wait for that – twiddling our thumbs and thinking about how much we prefer thinking about Hogwarts to, you know, taxes, the economy and other grim topics – let’s talk about Oreos. Seems the cookie company polled 2,000 parents and kids to discover the most beloved movie scene of all time, and the winner? The moment when Harry emerges onto Platform 9 3/4 in “Harry Potter and the Sorcerer’s Stone.” Happy sigh. It even beat out the Mary Poppins chimney sweep dance scene, ET phoning home and the Oompa Loompas.