There have been news and rumors of Netflix streaming to HD via silverlight on PCs and MACs, but now it is officially go time! Engadget and The Green Button are reporting that the WMC plugin for Netflix is now streaming HD, however there is no indication inside the plugin that the content is HD (which will probably be in an update).
Update 1: I have been doing testing as well and things aren't looking good for 1600 owners as it is sucking up the CPU and creating extremely choppy video. If you are simply using IE then you are in luck as you can manually force a bitrate, I recommend 1500. To do this start a video(not in full screen mode), on your keyboard press CTRL+SHIFT+ALT+M. This will bring up a menu for the player and you will need to select "Stream Manager". Check the "Manual Selection" option and then select 1500, and now it should stream back just fine. I am interested how it is working for 3610 owners. I have no fix right now for WMC except to avoid the HD videos
Update 2: Reports from users are that the AR3610 seems to be performing just fine. I did some testing on my Acer Aspire One netbook which just has integrated graphics and I get the exact same results as with my Revo which is very suspicious. I also overclocked my Revo to 1.8ghz and got the same results. Keep checking back and I will update with any other news and tests that I can. I created a thread in the forums for discussion.
Update 3: After looking around and watching the latest HDNation it looks like Silverlight does not take advantage of "Hardware Video Decoding", which is why this is choking on Atom Chips.