Here you will find the TWiT Army Ubiquity command. It's a complete rip off of the built in twitter command.

Enjoy

mykel

Actually, now it's just a script that mongo did, so thanks to him.

Wait.. changed again.. ccheath has added is.gd url shortening to it.

Oohh.. changed again.. I've added some changes to the formatting so it looks more like the web page when showing timelines and has clickable @users, #tags and URLS

.. and if you want, you can download/modify/whatever the script here

Alternatively, you might want to use twhirl.. see this page to see how to set up a public timeline on twhirl with XMPP.