This is a very basic user script which does the following:

• Checks the review homepage if there's anything you can review

  • If so, it changes the title to (n) old_title where n is the number of review tasks you can perform
  • If not, it refreshes the page in 15 seconds

Install the script

This is the script:

// ==UserScript==
// @name        Review Stalker
// @namespace   http://camilstaps.nl
// @description Stalks the StackExchange review pages
// @include     http://*stackexchange.com/review
// @include     http://*stackexchange.com/review/
// @include     http://stackoverflow.com/review
// @include     http://stackoverflow.com/review/
// @include     http://serverfault.com/review
// @include     http://serverfault.com/review/
// @include     http://superuser.com/review
// @include     http://superuser.com/review/
// @include     http://askubuntu.com/review
// @include     http://askubuntu.com/review/
// @require     http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js
// @version     1
// @grant       
// ==/UserScript==

var reviews_avail = 0;
var title = document.title;

$('.dashboard-num').each(function(index){
    if (!$(this).parent().hasClass('dashboard-faded')) {
        reviews_avail += parseInt($(this).attr('title'));
    }
});
if (reviews_avail) {
    window.setTimeout(function(){
        if (title == document.title) {
            document.title = "(" + reviews_avail + ") " + title;
        } else {
            document.title = title;
        }
    }, 300);
} else {
    window.setTimeout(function(){
        window.location = window.location;
    }, 15000);
}

Install the script