Many people like writing in journals for this same reason. I have never really been a writer myself, but when I'm tripping (usually on the come-down) I like to write down my thoughts. It's fun when I run into them every now and then and take a minute to read them, recollecting on my rants about random nonsense and what I thought about life. Much of it stills rings true, but it's nice to see how much I've grown since then.

If/when I have kids I will definitely be videotaping them all throughout their younger years, this is a wonderful idea.