The Denver Library is checking out these "power meter" kits. You can buy one for about $30 on amazon.com or get it from the library for free.
I feel items like this show off one purpose of libraries in a digital age: sharing physical items that a single house needs for a short time. I need a power meter to do tests on one day, not many days. I need a book only as long as I read it. etc.
In other library usage news: the computer lab was full of homeless folks spending most of their time watching youtube and hulu.
Obviously the downtown Denver library is different from some others, but these "new uses" of the space seemed like interesting points on the path of figuring out what libraries will become in a future where books are primarily written, produced, bought, sold, read, and shared via electronic devices.