Here are a few ways to include a reference to “140 Characters” in a tweet, email, or article. Instead of a hashtag, just use the mention:
Due to Ship: October 12, 2009.
The book jacket code.
<a href="http://j.mp/140-chars" title="140 Characters in 3D by Sagolla, on Flickr"><img src="http://farm3.static.flickr.com/2440/4009911664_f49ae378a1_m.jpg" width="175" height="240" alt="140 Characters in 3D" /></a>
Thanks for blogging, linking, tweeting, emailing, and generally promoting the work.