Good news
I just noticed that Merriam-Webster has evidently given Google Books permission to put their entire Dictionary of English Usage online. This is a wonderful book — probably the most well-researched, well-reasoned and just plain sane English usage manual in existence. It’s enormous fun to read and a joy to use. Give it a gander and you’ll probably want to buy a hard copy.
Merriam-Webster’s dictionary of English Usage – Google Books.