Starting today, Gmail now has some experimental features that you can choose whether to enable or not. Just head over to the Settings page and then click on the Labs tab. New potential features include the ability to bookmark specific e-mails, select custom stars for starring messages, custom keyboard shortcuts and mouse gestures. My favorite is the e-mail addict tool which lets you lock yourself out of your account for 15 minutes.
So far, I’m not seeing the new tab showing up, but I’m sure it will eventually.