http://blog.adamant.com.au/blog/software_stuff/40twitter_post_updates_every_40_minutes

Software from Mooj that rmeinds you to update your Twitter status.

From the page: “The software runs in the background and periodically reminds you to update your status on Twitter. With the click of a button you can update your status directly from within 40Twitter. You can even choose how often 40Twitter reminds you.”