You take notes and highlight phrases and sentences while reading electronically (the web, ebook), and although it’s very convenient to search, there is an advantage to having these on real cards (for instance on index cards) so you can “play” with them.
A service that takes all of your online notes and highlights, prints them on physical cards of your choosing and delivers them to you.
You are listening to an audiobook, and you hear something you would like to “highlight” or write a note about.
Have a function in your audiobook player to mark a section of the audiobook, phrase or a short sentence. You should also have an option to add your own note to that “highlighted” section. This – converted to text – should be accessible as a list of marginalia in the book.
Learn and have fun.
An augmented reality app. When you see something while walking that you think is interesting, or you know an interesting fact about it, maybe you discovered something, etc., you just launch the app, point the camera at the object and annotate it with your insight. You can also check and see what others have contributed regarding this object or other objects around you (buildings, signs, flowers, etc.)
Has this ever happened to you? You return from a vacation and don’t remember what you did on what day.
An app that alerts you whenever you arrive at a place to take a photo and caption it, and when you leave alerts you to write a short note (text or audio) about the place you just visited. At the end of the trip, you have a textual and visual timeline that you can export as a video, an HTML page, etc.