Finally, though we've considered dropping this service. This is a beta test for which you'll have to opt-in. To do so, following this link:
Get the Silverlight Plug-in here.
Mac owners who have been waiting for Netflix to open up the 'Watch Instantly' option just got a little something to light up their day -- the service is now available to the public; or at least members of the public who opt in via a web form. It's all based on Microsoft's Silverlight, so you'll need to download and install the plugin for your web browser, but please mind the six device limit if you've got a small cadre of 'Watch Instantly' devices in use. So if you can live with the fact that Microsoft tech is the lynchpin to your Mac streaming enjoyment, hustle on over and sign yourselves up for that non-HD, but ample selection of streaming content.