Some people use hyperbole to refer to the disclosure of Silverlight and CoreCLR by Microsoft at MIX07. April 30, 2007 has been called the day that will be remembered as the day that Microsoft "rebooted the web" . This might be true in more than one way...
Microsoft has announced that the little cross-platform, cross-browser cousin of Windows Presentation Foundation will be called Silverlight . This technology which was first announced at PDC05 was codenamed "WPF/E". Tim Sneath has the best list so far...