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There is also one thing to consider. Ebook-readers have usually 5 to 6 inch screen. If you design menus in A4/Letter size, text in screen will be considerably smaller. Depending on customer target this is - or is not a problem. Menus tend to be big in size and lettering as well.
I know there is bigger screens available. The price is also bigger then.
Yet another thing. Are you customers tech-savvy enough to use ebook readers? They might be having too much trouble using it, accidentally pushing buttons, powering off/on, etc. Are your waitressess cabable enough to teach customers when having problems with them. they will have to, i guess. It will take them lot more time to breing orders. For a customer, experience with readers might even be a drawback not to visit again.
If you customers are ok with ebook readers and want use them, not stealing them - there are readers which can read PDF/DOC files. But they usually won't come out good without special treatment, which is extra work for someone.
I sure would love to use them as a customer but I'm a nerd =D
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