You may be familiar with Pam Nelson, an ace copy editor at The News & Observer, and her blog, Triangle Grammar Guide. If not, you should be.
Either way, you'll need a new address to follow Pam's posts and quizzes. It's changed as part of a blog overhaul at the N&O site. You can now find Pam at:
http://blogs.newsobserver.com/grammar/home
