I think e-readers are a great piece of technology. Offerings such as the Amazon Kindle, the B&N Nook, and even the iPad are making it easy (and often cheaper) to get a book and read on the go. The ability to carry a library of books around in one device is really cool.
Think of how much cooler it would be if it became thin enough to roll it up to take it with you?
Well, that technology is coming: