each() setTimeout() , index .
var posts = $(".post").hide();
posts.each(function( index ) {
var $th = $(this);
setTimeout(function() {
$th.fadeIn('slow');
}, index * 300);
});
, setTimeout() n*600, .
, posts , .each() .hide(), $(".post").hide().each(func...)
EDIT: . this setTimeout(), . .
: . setTimeout() 300, .