To activate the Gmail Smart Labels feature go to the by clicking on the green icon in the top right corner and scroll down to Smart Labels. While the addition is a nice tool to combat e-mail fatigue, the feature may filter your inbox to death.

Filter Fatigue

In other words, if you categorize group mailings like newsletters with store promotions and more important notifications like credit card statements, will you ever read them? And, more important, do people actually filter their incoming e-mails anyway?

Stanley Chen, a software engineer at Google, on the "do people actually filter?" debate:

"Gmail's filters and labels were invented to help manage the deluge, but while I have about 100 filters that triage and label my incoming mail, most of my friends and family have all their messages in a giant unfiltered inbox," Chen explains on Google's blog.