WPF Everywhere

Codename WPF/E or Windows Presentation Foundation Everywhere in full, refers to the technology that allows lightweight XAML based applications to run within Internet Explorer, Firefox, or even Mac's Safari. To see what I'm talking about, download the CTP from here, and then check out the samples from here. According to several blogs, it's Microsoft's answer to Flash and other animation-oriented web-technologies. However, members of the community seem not to agree on whether it is purely based on Windows Presentation Foundation (such as mentioned in this blog) or relies heavily on AJAX such as mentioned on the download site.