Code:
http://mail.google.com/mail/help/about_whatsnew.html
Gmail Labs: A testing ground for experimental new features
Try out features in development and let us know what you think. To get started with Labs, click the Labs tab under Settings
Gmail has a new look on the iPhone browser
Now with auto-complete when composing, automatic refreshing, and faster load times when viewing email.
Group chat
Chat with multiple people without multiple windows. Invite your friends to a group discussion. To start a group chat, click 'Group chat' from the 'Options' menu when chatting.
Free IMAP
Sync your inbox across devices instantly and automatically. Whether you read or write your email on your phone or on your desktop, changes you make to Gmail will be seen from anywhere you access your inbox. Another way to use Gmail on your iPhone is through the browser. By going to m.gmail.com you get the full Gmail experience including conversation view, search, and more. Learn how to set up IMAP on other devices.
And Much More...