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:

The Full Mention
@thebook by @Dom Sagolla. http://140Characters.com A Style Guide for the Short Form.

The Big Mention
@thebook by @Dom Sagolla. http://140characters.com

The Short Mention
@thebook “140 Characters” http://dom.net/1

The Tiny Mention
@thebook http://dom.net/1

The Nano Mention
@thebook by @dom

The Amazon
http://j.mp/140-chars

The Borders
http://j.mp/140-chbo

The B&N
http://j.mp/140-chbn

The List
http://j.mp/140-list

Facts.

Due to Ship: October 12, 2009.
Publisher: Wiley
ISBN: 0470556137

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.