I was hoping that Microsoft would implement Avalon and the like in Longhorn using standards alas it's not to be, to quote the quoted:
"I think the bottom-line of XAML is that it is equally useful for creating both desktop applications, web pages, and printable documents. This means that Microsoft may be attempting to simultaneously obsolete HTML, CSS, DOM, XUL, SVG, SMIL, Flash, PDF. At this point, the SDK documentation is too incomplete to firmly judge how well XAML compares with these formats, but I hope this lights a fire under the collective butt of the W3C, Macromedia, and Adobe. 2006 is going to be a fun year."