When my son was born in 2001 I had grand desires to keep a scrapbook of all of the cute/funny/sad/momentous details of his life. Well, it turns out that was a lot of work, "scraps" got lost, scrap books misplaced, souveniers dissappeared, photos never got printed and time elapsed quickly. Never the less, the desire to keep track of my son's years still burned in me. I don't remember much about my childhood and I know even less of my fathers. My solution? Email.
I went to Google (not literally, well, literally on the web not the HQ in California) and created an email for him. Luckily no one else had his name. Now I can send all of my digital photos, comments, goings on, scans and more right to file he'll have until he's old enough to access.
I used GMail for it's reliability and storage capacity but any email account should work. Email automatically includes the date and digital photos store the date they were taken as well. With camera phones, iPads, 3G and WiFi you can easily send all those photos and details to a secure location. Of course, I also back those photos up on my computer. Just in case.