Here's a link to a 1.5 year-old article on Netflix devices. Considering we are a few years behind here in Canada, it should be just about right.
http://news.cnet.com/8301-17938_105-10249727-1.html
I am a PS3 owner, so that's how I'll be doing Netflix when it becomes available. I would imagine that Netflix will be available on similar devices here as the delays in getting the service here we due more to the legal/distribution models than the hardware.
Basically it looks like all of the 3 main, current console systems are compatible, as well as a growing number of other devices.
I find it interesting that the PS3 movie store just opened in Canada (finally) a couple of weeks ago, and now Netflix announces that they are entering the market. Let's keep it coming with Hulu next. Wishful thinking...