A service has been invented through which you can send messages to people in the future. To whom would you send something, and what would you write?

I would write a letter to little B and would write about all he little things that he does now that I really want to tell him about in the future.  Life’s so busy and my memory is so incredibly bad that I’m worried I won’t remember them.  

Since this service doesn’t exist yet, I’ll stick to photos, my family history journal and my ‘things I want to remember forever’ journal to keep a record!