Have you heard of Mary Norris? Her weekly videos for the New Yorker in her "Comma Queen" series will make your day, if you are a language junky. She is currently on the second season of the program and tackles issues like who/whom for dummies to the importance of serial commas. Norris began working at The New Yorker in 1978, and has been a query proofreader at the magazine since 1993. The woman knows her stuff, I think I learn something new every (3 minute) episode. A few favorites are listed below.
You can see all episodes here.