The two linguists responding to this message (on an educational linguistics mailing list) seem really happy with Lynne Truss's book:

FROM REUTERS:

Here Comes the Punctuation Vigilante Tue Mar 30, 2004 10:38 AM ET

By Paul Majendie LONDON (Reuters) - In the land of Shakespeare, punctuation faced extinction until writer Lynne Truss came to the rescue with a clutch of carefully placed commas and colons.

Taking a zero tolerance approach to grammatical lapses, she wrote a sprightly guide to punctuation, 'Eats, shoots and leaves,' that has sold more than half a million copies in Britain alone and soared to the top of bestseller lists.

Now, honing her crusading zeal over misplaced apostrophes, Truss is off to the United States to ensure transatlantic tidiness reigns supreme on the printed page.

See the full article here:

http://www.reuters.com/newsArticle.jhtml?type=topNews&storyID=4701134