Delete ALL your twitter direct messages from twitter.com.
I have my twitter messages redirected to my mobile and email account, so the fact that twitter stores my received messages just annoys me. I wanted to delete all of them, but only could do that one at a time, so I created this little script that will erase ALL your messages. Just enable it and go to http://twitter.com/direct_messages
, and leave the monkey trashing the messages while you do another thing!
If there is some way to do this through their web, well, it wasn't easy to find!
Happy message erasing!
Now it works on the "Sent" messages too. (Thanks to Chris for the suggestion!)