I always disliked that most tablets are so dang slick that it makes them harder to hold than was necessary. And despite the soft back, I think the Kindle Fire is one of them.
I just improved the situation a lot by putting on the back of the KF a couple of soft real-rubber pads I found last year:
http://ereaderjoy.blogspot.com/2010/...ber-grips.html
Eolake