Good grammar does not equal good writing! From The Economist
And you call yourself a prescriptivist? John McIntyre, Baltimore Sun
Charles McGrath, Death-Knell. Or Death Knell, an article on the hyphen
When commas are crucial to comprehension, Language Log blog post
Online guide to grammar and writing
Daily Writing Tips
Grammar Girl
The Grammarphobia Blog
Mighty Red Pen
Crystal Clear Proofing