Here are a few great links
The Chronicle articles on editing and grammar.
Cool verbs, my favourites are - micawber, pule and tyro.
More cool verbs.
Homophones - words that sound alike but are spelt differently with different meaning.
Punctuation marks?!! Use them, don't abuse them.
Oh and look at the lovely magazine I got in the post today. I love everything about Inis Magazine.