Pingdom is a service which provides tools to monitor web sites, E-Mail Servers, FTP servers and a multitude of other services.
Though I didn’t find the service that useful, they do seem to have introduced a nice little tool (free) to check the page loading speed.
(Replace the “url” parameter with the URL of your site)
The load time of all objects is shown visually with time bars. It will help in finding the culprit script/image which is probably affecting the page load of your website.
Meanwhile Pingdom.com is linking to a red site according to Mcafee SiteAdvisor !!
More details here: