PCMagazine has posted impressions from time with the 3DS at CES along with a short video.
One important thing in the article was that the 3D slider is used to find a personal 3D "sweet spot" as people with different eyesight will see 3D differently. I never knew that, and as they say in the video, it separates Nintendo hugely from other 3D displays. They also mention in the video that certain games will benefit from less or more 3D. They say Pilotwings benefits from more because more 3D allows you to see more depth when flying down long planes (not airplanes lol).
The article mentions 3D AR (my favorite feature) and what I found especially interesting was the 3DS measures the distant between the card and itself in real-time, and the particular card he was looking at folded itself into a box as if pieces of the table came up and closed in around it. Like I said 3D AR is my favorite new feature (without using it anyway) so I'm excited to hear about the table itself being used, and I hope it is as it sounds, and different patterned table will result in different boxes. The table itself was used again when a hole later appeared in it after he shot stuff at a dragon that popped out of the box, then the top of the table became trampoline-like.
He spoke with Reggie who said older children shouldn't play for more than half an hour. The journalist asked him what about movies, and he said parents would have to use their best judgement. Reggie also confirmed it's not a phone...
I'm sure lots of other people will be releasing impressions, and NWRs Kid Icarus impressions were also good, but a little critical considering we're at least 5 months from the finished product. All these people who aren't me getting to use the 3DS are making me jealous.

Edit: Typo, and I just also thought that it would be cool if different tables/surfaces the card rests on also breeds different dragons, perhaps even different difficulties.