JustUpdate: Just an update field, just for Twitter, for your iPhone/iPod Touch*.
Now available: JustUpdate, native app!. Free, simple, fast.
If you're like me you get your twitter updates on the go via SMS, but you have to pay to send SMS back to twitter. You might even be slightly bitter about this. So all you want in a web app is an update field, and perhaps a counter of remaining characters, one that if the update fails won't lose your text.
Launch JustUpdate (web edition).
Privacy wise: JustUpdate does not store your password or username anywhere other than a cookie on your iPhone/iPod Touch.
Provided free of charge, so do what you want with it, just don't blame me when you accidentally cause a meltdown of a nuclear reactor. Please. Any questions, complaints, death threats, just contact me.
*: Ok, so it looks ok in Safari 3 as well, but anywhere else the looks are probably not going to thrill you. JustUpdate takes advantage of (modified) iui CSS, and a small fraction of the iui JS.