This one comes from my friend @seiden, one of the guys who was in the jet of the battle for the first music website in the late 90s. Use the concept of Invisible Software and apply it to one of the biggest problems most people face on a daily basis: email.
The app would function like this: enter a few email addresses or keywords like the following:
Then whenever someone emails you with any of these items present in the email, the app sends you a text message or pop-up notification showing who it’s from, the subject, and the first sentence of the email.
Now you don’t have to keep going into your email nonstop. Boom.