A tie between the Nexus One and Google Glass. When I saw the Nexus One announcement I was intrigued and confused. What did it mean? I wanted one, but balked at the price (and ended up waiting some months and buying one on ebay). But when I finally got it, it was my first smart phone and I developed my first apps on it. Google Glass has the same kind of potential today. It's confusing and expensive right now, but it's changing how we interact with technology.