It's a Kindle Holder.  Also holds all other eBooks.

It's an iPad Holder.  Holds iPad's in portrait or landscape.

It's great for reading on airplanes.

BookGem - an excellent
little book holder.

The BookGem is a pocket reading stand that holds your book open, in a variety of comfortable reading positions. Twin spring-loaded clips hold the book securely, yet open easily so you can turn pages. Its folding legs make it versatile - use it at a desk, in your lap - even tilted over on a pillow for relaxing reading in bed!