http://www.onjava.com/pub/a/onjava/2005/06/15/laszlo.html

Laszlo offers an interesting option for rich client-side GUIs--XML markup of widgets and their event handling, which is then converted into a Flash executable that is run with the Flash plugin in the user's browser. Satya Komatineni introduces Laszlo and shows how to get started writing web applications with it. Jun. 15, 2005