Luckily I bought my S7 from frys. I'm on my 4th one. Every single one has had the same keyboard problem with the doubled keystrokes. I write software for a living, and this is currently my main dev laptop(on which I am running linux). I create about 200 doubled keystrokes per day while using this laptop.
IF YOU DON'T THINK YOUR S7 HAS THIS PROBLEM, I WOULD BET MY LIFE YOU ARE WRONG.
Please reply and lets keep this post at the top!
Oh, and get this... recently I was hosting the la hack night meetup, and someone saw me using my S7... He immediately came over and asked me if my keyboard was also broken. I showed him how it produces nonstop doubled keystrokes, and he proceeded to show me how much worse his is... His was so sensitive you could basically blow on the keyboard and it would type out a whole bunch of characters.
Acer, please do the right thing here. Issue a recall due to this massive design/QC failure and finally fix this.