Hope you like the idea of a smartwatch, because startups are not giving up on them. To wit, one of the most popular manifestations of the concept is the Pebble which began as a Kickstarter project that aimed to raise $100k. Instead, the company raised $10 million. Yes, a hundred times a hundred thousand. That investment seems to be paying off a bit, though, as today an Android app landed in the Play Store just prior to the first round of units arriving on customers' arms.
In Jelly Bean, Google introduced an incredibly useful new feature that allows users to find the source of a notification by long-pressing on it and selecting "app info." This is fantastic for those occasions when notifications are showing up without a clear idea of what is causing it. The problem is, that's only helpful on devices running Jelly Bean (which isn't a whole lot at this point).
For everyone else, there's a new app called Notification History.