Is it good-bye or goodbye? E-mail or email? Just which is the correct spelling? There may be little confidence left in the once common but now endangered hyphen: http://goo.gl/ZhGiK
In case you're wondering, in 2011 the AP Stylebook changed the "correct" spelling of e-mail to email. The hyphen truly is disappearing -- and getting approval for it too. Read the full report.
You can also purchase the latest AP Stylebook to review the latest style changes.