Any overly-complicated gadget designed to do a mundane task that can be done much more easily, cheaply, simply, and often better with an old-fashioned, low-tech device. Typically, a digital carrot slicer runs on batteries, has more options and "features" than anyone really wants, costs too much, is difficult to use, provides the user with more information and precision than they need, and is less reliable compared to the low-tech tool.
Compared to pencil and paper for taking notes, a PDA is a digital carrot slicer.
Why use a sharp knife to cut up a carrot when you can use a digital carrot slicer?
Hey, I just got paid yesterday, let's go the the mall and buy a digital carrot slicer at the Sharper Image!