how do I get a mac os in virtualbox on ubuntu 11.04 with any installation CD

VirtualBox does not support OS X at all. Maybe... Some earlier versions designed to run on x86 hardware... PowerPC etc however I've never seen it mentioned.

There is very limited support for OS X server, however there is most likely restrictions on what hardware it will run on, and what versions you can get running at all. This is covered in the VirtualBox manuals.

You might want to look at VMWare, which apparently _can_ run OS X, though I've never used it.
http://wiki.osx86project.org/wiki/index.php/Vmware

Chris

it can be done http://www.youtube.com/watch?v=NRsg1wGESIk

it can be done http://www.youtube.com/watch?v=NRsg1wGESIk

You will need to buy an install cd and license. I'm also not sure the mac licensing permits virtualization and you must check this.
You can also install netflix in WindowsXP which is drastically lighter, cheaper and better supported in virtualbox so I am baffled as to why you want to use acOS.

Just a side note. When you use Netflix, you will be running BOTH OSes at the same time, using resources for both. If you don't have a decent system, it will struggle to run smoothly.

I wont to maintain a windows free lifestyle

will A Google Chromebook with Chrome OS 13 or higher work in virtualbox to operate netflix?

ChromeOS is based on Linux (probably even Debian or Ubuntu). Netflix NEEDS DRM to work and Linux currently doesn't have an implementation of it, so you need Windows.

Have you tried Miro?

http://forums.virtualbox.org/viewforum.php?f=22&sid=832c079e1f80545440f79f1f0b1a3334
Have a look at this forum, your question is more a VirtualBox or Mac OS X question than an Ubuntu one.