Laszlo is the premier open source platform for the development and delivery of rich Internet applications on the World Wide Web. - what? This thing just got put under an open source license and is already supposed to be the "premier open source platform"? Zope, Drupal, Mambo, Typo3, Plone, Brickolage, Scoop, Xoom, Slash and all the others - are those all figments of imagination? Apart from that, LAMP is probably (unfortunately - I like neither MySQL nor PHP) the leading platform if you interpret platform in the usual sense.
Marketing hype has moved in with the companies into open source as well.