While I'm at my office computer I sometimes just need to vent in writing. I usually ssh into the root of my VPS and write a journal entry using a text editor like nano. I feel more secure with private stuff there than typing, say, into Google Docs. To reduce the hassle of signing in to another computer just so I can journal, I've written a web app that allows a user to write an entry, then save it in encrypted form to the browser's localStorage. A user can then enter the password for a specific entry (by looking at its timestamp) to decrypt it and read it.
Please try it out and let me know what you think.