http://weblaunch.blifax.com/listener3/redirect?l=824869f0-503b-45a1-b0ae-40b17b1fc71e

This is display.cgi (source). It takes some text you enter into a form, and displays it for you as HTML. This is a great way to see how some HTML code looks in your (or someone else's) browser. So paste 'n go: