"E-mail" or "Email"?
The editors at the social media news website Mashable implied that the change was long overdue, running their story with a headline "AP Stylebook finally changes 'e-mail' to 'email.'" On the other hand, the New York Times announced that they'll stick with "e-mail."
What this all shows is that whether to use a hyphen in "e-mail" is a style choice, and Mashable is more permissive than the Associated Press, which is more permissive than the New York Times when it comes to language change.
I asked the AP Stylebook editors why they made the change, and they said most of their writers already turn in articles with the "email" spelling, and copy editors found "e-mail" increasingly difficult to police. They emphasized that they don't consider themselves to be on the leading edge of language change; that instead, they "bow to common usage."