Peter Alguacil and his team have created Pingdom, a free tool that tests the load time of websites and all included objects such as images, CSS files, scripts, etc, and shows this information graphically with an Ajax interface.
The load time of all objects is shown visually with time bars.
You can view the list of objects either in load order or as a hierarchy. The hierarchy view allows you to see which objects are linked to in for example a CSS file.
Every test also shows general statistics about the loaded page such as the total number of objects, total load time, and size including all objects.
This Full Page Test was inspired by the OctaGate SiteTimer. We liked what they did and wanted to take the idea one step further.