Is there a high quality webcam-cover solution for a MacBook Air?
What about c-slide? (http://www.c-slide.com)
1 mm thin and works with all latops and pad devices.

The cool thing is that you can open and close it without having to remove any parts from you laptop. And it's sleek, the only downside is that it is black and might not look very nice on a white MacBook frame.