OhLife is an email-based private online journal site, where you can keep, well, your private online journal.
Once you sign up, every night OhLife emails you the question "How did your day go?" Just reply with your entry and it's saved instantly.
What's the interesting twist? After you have accumulated a backlog of journal entries, OhLife will start to send them back to you randomly, so that you can reflect on them. Like this:
Pretty interesting idea.
Find out more at OhLife.