JotOnce is a web-based scratch pad with an emphasis on simple and secure note-sharing. Share notes secured with a password, expiration dates and more.
When using JotOnce you can keep things as simple as pasting a block of text, clicking "Post Jot", and sharing the link with a friend. Take advantage of the more advanced features, however, and you can lock the note down with a password, turn on has-been-read email confirmations, and set an expiration date for the note (10 minutes to 10 days).
JotOnce is a free service and requires no registration. For other web-based note-taking tools check out previously reviewed SimpleText.