Flash, Meet Sparkle
Robert writes "Microsoft finally released more information about their Sparkle product on a Channel 9 MSDN video. Sparkle is vector based XAML system for doing applications that may have traditionaly been done in flash. Ars Technica's Josh Meier has a few things to say about it, too."
1) Sparkle is not a technology. Sparkle is the codename for an application. Get it right.
2) The technology is Windows Presentation Foundation (formally codenamed Avalon).
3) It is not a flash killer. It is true that you can host Avalon applications in a web browser, and they will interact with the back and forward buttons of a web browser. It is true that Microsoft is touting this as a high-end replacement for HTML (as far as I can tell).
4) Although details are sketchy, Microsoft has announced a royalty free OPEN technology called Windows Presentation Foundation / Everywhere. This means that you can run these applications in ANY web browser on ANY platform.