Get Your Finger Out!

Thanks to Life hacker for the link to Hassle Me.

This is an online service that you can configure to send you e-mail on a periodic basis, reminding you of things you would otherwise forget.

For example, if someone's birthday is coming up, you could have Hassle Me remind you every other day until you purchase a present. You could use it to remind you to pay a bill ... or get some exercise ... or catch up with a friend ... or ... I think you get the idea.