I just came across this article titled a "Sending the future you e-mails"
In a nutshell, you can send yourself an e-mail to arrive in the future.
This is an interesting concept. The thing about this type of project is that you write the e-mail, send it, then forget about it. If it's something you keep remembering or going back to, it won't have the same impact. So, what happens if your e-mail changes? Hmmm, no e-mail I guess.
I think this is a pretty cool idea, nonetheless. www.futureme.org There are some publicly displayed e-mails if you want to read them. Go check it out.