Twine

I think this would solve a first-world problem I had awhile back: when our bedroom was on the second floor and the laundry was in the basement, it was inconvenient to run down two flights of stairs to change a load from the washer to the dryer. Even worse, on a cold night, was getting down there 3-5 minutes before the washer was done.

In a world where refrigerators are connected to the Internet, it's inconceivable to me that my washing machine can't text or email me when it's finished.