IdentityTheft hides all the overhead names, titles, guilds, and health bars for all units to streamline the screen shot taking process.

Macro Command
/script IdentityTheft.StealIdentities()

The IdentityTheft command above is a toggle switch. It will initially store all of your current overhead name, title, guild, health bar settings in to a temporary table, then turn everything off. Running the command again (ie, toggle) will restore all of your previous overhead name, title, guild health bar settings, and turn on those that were previously checked.

IdentityTheft was created to satisfy the many requests for a "name toggle" addon, posted on WHA. It assists those players that like to take screen shots, but find it tedious to turn off every overhead setting manually.

Warning!
There is currently a UI bug that will still show your target's title, regardless of whether it was turned off manually or turned off by IdentityTheft. I have posted a bug report to Mythic already.