Results

function makeLimited(fn, count) {
    var queue = [];
    var outstanding = 0;
    return function() {
        var args = Array.prototype.slice.call(arguments, 0);
        // replace the last arg by one that runs the
        // next queued fn
        args.push(adviseAfter(args.pop(), next));
        if (outstanding < count) {
            outstanding++;
            fn.apply(this, args);
        } else
            queue.push(args);
    }
    function next() {
        if (queue.length)
            fn.apply(null, queue.shift());
    }
}
$.throttled = makeLimited($.get, 2);    
for (var i = 0; i < 10; i++)
    $.throttled('services/sleep/2', log);
function adviseAfter(fn, afterfn) {
    return function() {
        var result = fn.apply(this, arguments);
        afterfn.apply(this, arguments);
        return result;
    }
}