Nextbook, the lively, fun, eminently readable Web site devoted to Jewish culture, has been praised on Snobsite before. But now there’s a whole new reason to visit: Film Snob’s Dictionary co-author Lawrence Levi has launched a blog on the site called Nothing Sacred. Lawrence, a known Jew, will be surveying the cinematic landscape and offering his own Jewy, provocative, tzimmes-stirring gloss on it. Already, he has inflamed passions by questioning why Roman Polanski would ever want to hang out with Brett Ratner.