Seems interesting. Besides the fact that it is not open source, I'd like to know how it compares with Phantomjs: http://code.google.com/p/phantomjs/
Edit: Guess the most important difference is that Awesomium is embeddable gui browser, while Phantomjs is headless, more suited to using the browser as a library, and suited for programns to to browse the web, not users.
Not exactly-- awesomium can be used for both headless rendering and embedded GUI rendering. It outputs to a BGRA 32-bit pixel-buffer; it's the embedder's job to display it in their respective UI framework.
Edit: Guess the most important difference is that Awesomium is embeddable gui browser, while Phantomjs is headless, more suited to using the browser as a library, and suited for programns to to browse the web, not users.