All the very best tools are impressively simple. Here is one of those why-didn’t-I-think-of-that ideas. www.nudgemail.com.
This is the simpliest reminder system I have ever come across. Even the instructions they give are simple, so I’ve quoted them directly:
1. Create a new email (or forward an existing one)
2. Set the “to:” to the day/date/time@nudgemail.com. For example, “monday@nudgemail.com” or “tomorrow@nudgemail.com” or “feb12@nudgemail.com” or “2hours@nudgemail.com” are all acceptable ways to send a NudgeMail
3. Enter anything you want in the subject and body of the email, then hit Send!
Your reminder will come back to you as an email, to the email address you sent it from, when you asked for it. For those of us who organise much of our working lives through email, what could be simpler?