oYeah! came as just another to-do list app, but I saw a missing place in the marketspace - geolocation & chained-based reminders. At the time, no other product was doing this. oYeah! let users create reminders/tasks based on their location or time, but more interestingly, it let you chain all those things together. Get notified to Pick up Dry Cleaning when you got near the location. Complete that task, then another one fires off reminding you to, "Lay the clothes down in the backseat." oYeah! gave the user a lot of power. Branding & design played off the fun of the name, with color schemes that people could switch between or create on their own.