Back in May last year, I wrote a post about a new Firebug (for Firefox) Plug-in called Page Speed, that allowed you to test the load time of your website and get some useful tips on how to improve this.
This week, Google took that idea and extended it into an independent online tool, making it available for anyone on any browser. It uses a version of WebKit installed on a server to run the test (via the Chrome version of Page Speed Im guessing) to test your site and suggest improvements.
It seems to work in exactly the same way, and suggests the same kinds of things to improve your score, and has the same issues I pointed out last time, in that it marks you down for incorrect caching on Google Services you include on your page (Analytics in my case).
Read the Google post or start testing your site, please note tho, that as its being hosted on the Google Labs site, this could (as many have done before) disappear without warning. If it does I’ll update this post to reflect that.