I'm using this custom autocomplete for actualito.com

custom jquery ui autocomplete

$(function(){
    $.widget('custom.actualito_autocomplete', $.ui.autocomplete, {
        _renderMenu: function(ul, items){
            var that = this,
                currencyCategory = '';
            $.each(items, function(index, item){
                if(item.type != currencyCategory){
                    ul.append( "<li class='ui-autocomplete-category list_item_container filter'>" + item.type + "</li>" );
                    currencyCategory = item.type;
                }
                that._renderItemData(ul, item, item.type);
            });
        },
        selected: function(event, ui){
            var item = ui.item.data( "item.autocomplete" );
        }
    });
});

$(function(){
    var accentMap = {
        "á": "a",
        "é": "e",
        "í": "i",
        "ó": "o",
        "ú": "u",
        "ü": "u"
    };
    var normalize = function(term){
        var ret = "";
        for ( var i = 0; i < term.length; i++ ) {
            ret += accentMap[ term.charAt(i) ] || term.charAt(i);
        }
        return ret;
    };
    $('input.seeker-autocomplete').actualito_autocomplete({
        delay: 0,
        minLength: 2,
        source: function(request, response){
            var matcher = new RegExp( $.ui.autocomplete.escapeRegex( request.term ), "i" );
            response( $.grep( homepage_seeker, function( value ) {
                value = value.label || value.value || value;
                return matcher.test( value ) || matcher.test( normalize( value ) );
            }) );
        },
        select: function(event, ui){
            window.location = ui.item.url
        }
    });
});