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Self-help for the grammatically unsure
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Eats, Shoots & Leaves: The Zero Tolerance Approach to PunctuationEats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation by Lynne Truss
Buy new: $13.57 / Used from: $0.01
Best seller punctuation handbook; from the UK
Write Right!: A Desktop Digest of Punctuation, Grammar, and StyleWrite Right!: A Desktop Digest of Punctuation, Grammar, and Style by Jan Venolia
Buy new: $10.10 / Used from: $3.48
4th edition
The Blue Book of Grammar and PunctuationThe Blue Book of Grammar and Punctuation by Jane Straus
Buy used from: $22.96
7th edition
Woe Is I: The Grammarphobe's Guide to Better English in Plain English, Second EditionWoe Is I: The Grammarphobe's Guide to Better English in Plain English, Second Edition by Patricia T. O'Conner
Buy new: $13.57 / Used from: $1.62
Expanded edition
Grammar Smart, 2nd Edition (Smart Guides)Grammar Smart, 2nd Edition (Smart Guides) by Princeton Review
Buy new: $9.32 / Used from: $2.98
2nd edition
Grammar without Grief : The Ultimate A to Z for the Stylistically Clueless and the Grammatically ChallengedGrammar without Grief : The Ultimate A to Z for the Stylistically Clueless and the Grammatically Challenged by Martin Steinmann
Buy new: $13.95 / Used from: $0.49
Action Grammar: Fast, No-Hassle Answers on Everyday Usage and PunctuationAction Grammar: Fast, No-Hassle Answers on Everyday Usage and Punctuation by Joanne Feierman
Buy new: $9.50 / Used from: $0.07
Better Grammar in 30 Minutes a Day (Better English Series)Better Grammar in 30 Minutes a Day (Better English Series) by Constance Immel
Buy new: $10.39 / Used from: $2.71
Grammar for Smart PeopleGrammar for Smart People by Barry Tarshis
Buy new: $11.97 / Used from: $0.68
Punctuate It Right (Punctuate It Right!)Punctuate It Right (Punctuate It Right!) by Harry Shaw
Buy used from: $0.01
Punctuation Plain & Simple (Plain and Simple Series)Punctuation Plain & Simple (Plain and Simple Series) by Edgar C. Alward
Buy new: $11.66 / Used from: $1.67
The New Well-Tempered Sentence: A Punctuation Handbook for the Innocent, the Eager, and the DoomedThe New Well-Tempered Sentence: A Punctuation Handbook for the Innocent, the Eager, and the Doomed by Karen Elizabeth Gordon
Buy new: $8.76 / Used from: $2.10
A guide to sentence punctuation with extremely whimsical examples (2003)
Copyediting: A Practical GuideCopyediting: A Practical Guide by Karen Judd
Buy new: $13.60 / Used from: $5.49
3rd edition
How to Be Your Own Best Editor: The Toolkit for Everyone Who WritesHow to Be Your Own Best Editor: The Toolkit for Everyone Who Writes by Barry Tarshis
Buy used from: $4.86
Edit Yourself: A Manual for Everyone Who Works with WordsEdit Yourself: A Manual for Everyone Who Works with Words by Bruce Ross-Larson
Buy new: $11.16 / Used from: $3.27
Lapsing Into a Comma : A Curmudgeon's Guide to the Many Things That Can Go Wrong in Print--and How to Avoid ThemLapsing Into a Comma : A Curmudgeon's Guide to the Many Things That Can Go Wrong in Print--and How to Avoid Them by Bill Walsh
Buy new: $11.53 / Used from: $2.76
Cranky but fun
Go Ahead, Proof It!Go Ahead, Proof It! by K. D. Sullivan
Buy used from: $0.01
The basics, for beginners
Handbook for ProofreadingHandbook for Proofreading by Laura Killen Anderson
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Words Fail  Me: What Everyone Who Writes     Should Know about WritingWords Fail Me: What Everyone Who Writes Should Know about Writing by Patricia T. O'Conner
Buy new: $8.64 / Used from: $1.90
100 Ways to Improve Your Writing (Mentor)100 Ways to Improve Your Writing (Mentor) by Gary Provost
Buy new: $6.99 / Used from: $2.91
Sin and Syntax: How to Craft Wickedly Effective ProseSin and Syntax: How to Craft Wickedly Effective Prose by Constance Hale
Buy new: $10.17 / Used from: $5.97
How to write well by breaking the rules.
Better Sentence-Writing in 30 Minutes a Day (Better English Series)Better Sentence-Writing in 30 Minutes a Day (Better English Series) by Dianna Campbell
Buy new: $10.39 / Used from: $3.99
Stunning Sentences (The Effective Writing Series)Stunning Sentences (The Effective Writing Series) by Bruce Ross-Larson
Buy new: $8.76 / Used from: $3.26
Powerful Paragraphs (The Effective Writing Series)Powerful Paragraphs (The Effective Writing Series) by Bruce Ross-Larson
Buy new: $11.01 / Used from: $3.59
Better Spelling in 30 Minutes a Day (Better English Series)Better Spelling in 30 Minutes a Day (Better English Series) by Robert W. Emery
Buy new: $9.35 / Used from: $3.99