4 Gmail Labs features you should be using

As powerful as Gmail is, you make it even more productive with add-ons from Gmail Labs. If you’re new to Labs, it’s the testing ground for Gmail’s more experimental features. The successful ones go on to become standard Gmail capabilities—the much-loved Send & Archive button was once a Gmail Lab experiment—but while they’re in the Labs, there’s always the outside chance they could break, change, or disappear.