If you're crafty, you can now publish a tweet longer than 140 characters. It's not a feature, but rather a bug, so don't expect it to be possible for much longer.
We first read about the bug in the Twitter Development Talk Google Group, where forum user Chris White posted a step-by-step of how to make it happen. He wrote that you go directly to the Twitter Share URL (http://twitter.com/share?url=) in the Firefox web browser and put your tweet's text after "url=" — for example, "http://twitter.com/share?url=This is a test of the Twitter 140 character bug."
The result is a tweet box with a shortened http://t.co/ link (that's Twitter's URL shortener). Then you can just click the tweet button and the full-length tweet will go out on your account. It will display properly on Twitter's website, but many third-party web, desktop or mobile apps will fail to show the whole message.
Twitter user TenhoMania published a tweet that included the entire first chapter of the book of Genesis from the Hebrew Bible — not a wholly original idea at this point, but special for its 3,000+ character length, at least. That and several other lengthy tweets have been retweeted numerous times.