[рони]

pekinessik,

$(function() {
    var a, b;
    $(".goods-categories-container .grid").each(function() {
        b = $.trim($(this).find(".title-brand").text()).substr(0, 1).toUpperCase();
        b != a && $('<div class="letter">' + (a = b) + "</div>").insertBefore(this)
    })
});