Apple Thoughts: Get the Most out of Gmail

"Five years after launch, Google finally took Gmail out of Beta last summer. But make no mistake, Google continues to constantly update the product with new experimental features."

This article goes through some of the more obscure features of Gmail, such as "Wrong Bob" to alert you that you are sending the email to the wrong Bob in your address book, or "Mail Goggles" that requires you to complete simple math problems before actually sending the email to the recipient so that late night email writing campaign doesn't create a disaster.