People always ask, What makes a TOH Top 100 product? Tough question. The truth is, there's no single answer that covers everything in the following pages. Many items on our list impressed us for their ingenuity, like the kitchen knife that won't dull. A good number are terrifically original, like the handmade tile you customize online. We always look for breakthroughs, of course, like the most efficient water heater. Other honorees surprised us by how well they work, like the Paint Handy. Some products are just too cool to pass up, like the fridge that dispenses sparkling water. In the end, our decision making comes down to another question altogether: Is it useful, and is it relevant for our readers? Now it's your turn to be the judge.