I love www.copyblogger.com. Loads of advice, easy to read, very entertaining. Here are a few articles that every writer should read –
From assuming a proofreader mindset to proof-love with other bloggers to reading aloud, Shane Arthur writes 14 Foolproof Proofreading Tips for Bloggers.
Mixing ‘effect’ and ‘affect’ or ‘its’ and ‘it’s’ in your writing? Try Brian Clark’s Five Grammatical Errors that Make You Look Dumb.
‘Afterwards’ and ‘towards’ are not words. See Brian Clark’s amusing The Inigo Montoya Guide to 27 Commonly Misused Words.