Gmail got a face-lift today. The main sections Mail, Contacts and Tasks are links on the top left. All actions are buttons so Compose was changed to a button as well. Small changes but have a look at this line in the change log.
A smaller header area puts the first message in your inbox about 16 pixels higher on the screen.
Now that’s the kind of detail most people don’t bother with. These days sweating the small stuff seems to be the way to keep above the competition.