A new way of reminding day to day ToDo's / business activities / meetings / mailers / reminders and more...

A kind of app, which has taken its ground from the amount of working and entrepreneuring professionals day to day activites. How different can we think of reminding them? We saw a recent advancement through Google whcih asked you when you use words like attachments / find attached etc. on your mail without an attachment actually. This is because the users are so much into the mail and its content forget doing simple things (missing attachments). This is quite normal and is usual in industry. Similarly, people tend to forget things they promise (including meetings, ToDo's, schedules, meetings, parties, so on...) over phone (while on conversation) and if there can be an app which eases this with kind of innovation that would be the need for the day.