"Eats, Shoots and Leaves" is entertaining.

I believe there are some entertaining e-books put out by Scholastic TeacherExpress that might help too. We downloaded these when there was a dollar-per-PDF sale, which they run pretty frequently. We haven't used any of them but they might be helpful:

More Proofreading Practice, Please! Grade 3
More Proofreading Practice, Please! Grade 4
More Proofreading Practice, Please! Grade 5
No Boring Practice, Please! Funny Fairy Tale Grammar
No Boring Practice, Please! Funny Fairy Tale Proofreading
No Boring Practice, Please! Punctuation and Capitalization
No Boring Practice, Please! Sentence Structure
Revision Mini-Lessons: Grade 3
Revision Mini-Lessons: Grade 4
Revision Mini-Lessons: Grade 5
Revision Mini-Lessons: Grade 6
Super Sentences and Perfect Paragraphs
Writing Skills Made Fun: Capitalization, Punctuation and Spelling
Writing Skills Made Fun: Parts of Speech
Writing Skills Made Fun: Sentences and Paragraphs

I'd also look into resources on sentence diagramming, on the basis that it might help, at least with certain problems such as comma placement, to understand sentences more from a structural perspective. These books are highly rated:

Rex Barks
Better Sentence Structure Through Diagraming (one in a series)
Diagraming Sentences


Striving to increase my rate of flow, and fight forum gloopiness. sick