GMail Themes

You can now customize the look of your Gmail by setting up themes. Inside your Gmail, click on the Settings link then go to the Themes tab. Choose from a wide variety of themes, over 30 themes to choose from.

For more information: 

http://gmailblog.blogspot.com/2008/11/spice-up-your-inbox-with-colors-and.html

GMail Voice and Video Chat

GMail has a new feature, the GMail voice and video chat. Now you can talk to the person you are chatting to and also you can see that person if he/she has a webcam. Its a good thing that it is integrated to GMail in which you don't need to install any software(excluding Adobe Flash Player) in your computer just to do a voice or video chat. You only need a speaker and microphone to do a voice chat, a headset w/ mic is recommended. For a video chat, obviously, you need a webcam. ;)

For more information go to : http://www.gmail.com/videochat