I'm touched by this idea over at The Nesting Blog.
A dad has woken up at dawn for the past 15 years to write a letter to his children.
A mother did a similar thing--although in a less time-intensive manner. She set up an e-mail account for her son and every time something memorable happens, she jots down the quote or the story in the e-mail account.
It would be sweet to write letters to your significant other during the dating process and your engagement and then present them to him/her on your wedding day. What a great gift! I was just trying to come up with gifts to give during the wedding ceremony on this post here.