Saw today that this was released recently
From the website:
Has anyone been brave enough to try this yet and see if it gives a bigger performance boost compared to netflix-desktop package? I can run netflix-desktop on this 2007 tower but I believe sometimes the framerate might be dipping a bit as I can see tears in the image but yet the audio seems to keep up. It sounds like it might be less resource intensive by just allowing Silverlight 5 to run instead of just running a windows version of firefox plus silverlight 4 under WINE.Today we want to present you our latest project Pipelight, which allows to run your favorite Silverlight application directly inside your Linux browser. The project combines the effort by Erich E. Hoover with a new browser plugin that embeds Silverlight directly in any Linux browser supporting the Netscape Plugin API. He worked on a set of Wine patches to get Playready DRM protected content working inside Wine and afterwards created an Ubuntu package called Netflix Desktop. This package allows one to use Silverlight inside a Windows version of Firefox, which works as a temporary solution but is not really user-friendly and moreover requires Wine to translate all API calls of the browser. To solve this problem we created Pipelight.
Pipelight consists out of two parts: A Linux library which is loaded into the browser and a Windows program started in Wine. The Windows program, called pluginloader.exe, simply simulates a browser and loads the Silverlight DLLs. When you open a page with a Silverlight application the library will send all commands from the browser through a pipe to the Windows process and act like a bridge between your browser and Silverlight. As a user you will not notice anything from that "magic" and you can simply use Silverlight the same way as on Windows, like you can see on the following screenshot: