There are different blog posts and forum threads discussing this and the challenges encountered (Silverlight, DRM, etc.).
Also read about the XBMC Flicks addon.
But, did anyone succeed to stream Netflix content on the Raspberry Pi?
Even more, through Raspbmc?
Use comments to ask for more information or clarify a question or answer.
You can always comment on your own questions and answers. Once you earn 50 reputation, you can comment on anybody's post.
Remember: we're all here to learn, so be friendly and helpful!