The Observer is starting to get a little weary of all these comic book movies –do we really need when we’ve got franchises for Batman and Superman? — but when we caught The Dark Knight opening weekend at the IMAX near Lincoln Square, we couldn’t help but get pretty psyched about Zack Snyder’s adaptation of Watchmen, the graphic novel by Alan Moore and Dave Gibbons about a group of ex-superheroes fighting to save themselves (and humanity, of course), due in 2009. And apparently we’re not alone: The New York Times reports this morning that the trailer seems to have spurred a run on the Watchmen book. DC Comics has printed an extra 900,000 copies of it since the trailer began running in mid-July, and would have a print run of a million by the end of the year. In 2007, the graphic novel sold 100,000 copies.