I was going to say, looking back on the journal would be interesting. Now that I think about it, I did used to do this thing where I would send an email to this particular address which kept your messages as a diary.
From time to time it would send you a reminder to write a diary entry and send you a random entry that you sent before. It was fascinating to read what I had written before and see the mindspace that I was in.
I like that email thing. It's be an interesting way to "journal" one's life, thoughts etc. Create an address specifically to send emails to and they're time-stamped and collated by date. Going back over them years later would revealing I'd say.