Here's a coffee maker that does more than just make coffee: it let's you know the weather.
DirectBand uses a carrier wave inside of regular FM radio signals and, since the infrastructure for FM is already widespread, there's no waiting for the towers to be put into place. It also provides a revenue stream for radio broadcasters.
The .NET Micro Framework takes up a mere 300k of space. Compare that to the full framework at 23mb and the Compact Framework at 3mb.
There's even a book in the works on the Micro Framework.