FAQ:

Q: How secure is this thing?
A: Pretty secure.

Q: Huh?
A: Well ... Twitter's systems are set up in such a way that we have to store your login details briefly.
Your twitter UN/PW are encrypted and stored in our db with the post itself.
Even our database support staff cannot see this information.
As soon as it is posted, the login details and post are deleted.
To access your account details, a bad person would have to compromise both the code and db,
and then would only have access to users who currently have upcoming tweets in the system.

Q: What about this "Save my login" thing?
A: This encrypts your details, and puts them in a cookie that is stored on your browser.
Your login details do not remain on our server if you have no upcoming posts.

Q: My tweet was posted, but at the wrong time?
A: Currently the system uses local time at the hosting service in Arizona.
We are working on proper time zone support, so please bear with us.