The biggest advantage to e-ink display technology is its incredible battery life. It means your Kindle can flip through book after book before needing a charge, and it allows this gorgeous digital wall clock to run for months on just a single cell-sized watch battery.
It also makes the clock remarkably light. It attaches to a magnetic mount that attaches to your wall with a single screw. You'll still want to make sure there's a stud behind it, but lifting the clock into position is easy. A pair of black buttons on the front allow the time to be easily set, and it's available in various colors for $500. It's not as cheap as taping a Kindle to your wall, but it sure is a lot prettier. [Twelve24Clocks]