WPF/E - Everywhere?

WPF/E is WPF “Everywhere” – a targeted subset of features from WPF that will be made available cross-platform. Note that WPF/E is different from Avalon “Express” (now known as XAML Browser Applications), which refers to an in-browser, security-sandboxed deployment model for full WPF applications.

Would it be awesome to write code once and deploy everywhere? well...

Vista's development tools use cross-platform standards, so you can use them to write normal apps that will run on multiple platforms or Web-based apps with multiple browser support