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5.1 audio is hardly a feature, it's a necessity when it comes to a home theater setup for movies. The fact that Netflix has not had support for this until just now is really stupid, and makes me happy I don't use their service because I would be pretty unsatisfied with what they offer. That said, good for them for finally adding it. I do think 5.1 in Netflix is likely to work with the Apple TV at some point as well, but who knows when that would be.

As for 1080p, we all know the answer to that, there is no support for that on the Apple TV, so it won't be happening anytime soon. Personally I prefer 1080p when possible, but I really don't like highly compressed 1080p anyway. It makes sense for Netflix to support it with the PS3, but would really have to see what kind of encoding they are going to do because the 720p from Netflix I have seen didn't impress me at all either.
 
You can connect Apple's Bluetooth Keyboard to the PS3.

If I have to require my family to use a keyboard in the living room to operate our entertainment center, they blew it. :p Seriously, this is the same reason the Google TV devices will probably fail to sell well and why HTPCs have never gone mainstream either. Putting the focus of the user interface on the TV itself with a device that is supposed to bring all the web to your tv will always require a keyboard or some other non optimal input solution and only geeks will be comfortable with that setup for long.

This is why I think Apple is going with a minimal interface on the TV itself and putting all the options directly on your iPhone, iPod Touch, or iPad with the ability to send the audio/video to the TV with Airplay. People enjoy using their iOS devices and are comfortable with them. Viewing, searching, navigating, and selecting content with an iPad while stretched out on the couch with your feet up is an enjoyable and relaxing experience. It beats a remote navigating a screen 10 feet away. A keyboard isn't even in the running.
 
Not that I have an issue with improved quality, but for $9 bucks a month, Netflix could use the same or less compression that iTunes uses for SD content and I'd be more than satisfied.

Many of the shows I've watched (Pushing Daisies, Dirty Jobs) on Netflix look great.

Any improvements I just consider to be a bonus.
 
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