Gmail add “Mark as Read and Forgotten attachment detector”

Gmail Labs added two new experimental features: “a Forgotten Attachment Detector — once turn on, you'll get an alert if you mention attaching a file but forget to do so. The attachment detector couldn't recognize patterns like "I attached a file", "Check the attached file", but it worked when using: "I've attached..." and "I have attached".

Second one: Mark as Read button —  If you're tired of digging into the "More actions" menu every time you want to mark unread messages as read, just turn on this Labs feature to add a "Mark as read" button to the top of your inbox.