The Gmail app for Google's Nexus One phone is really cool and has four amazing features to it. And since the phone runs Android 2.1, this adds a couple of new features to the native Gmail application. You can get the Android Gmail app from Gmail Android page on mobile.google.com/android.

The features are:

• Quick contact badge:  A handy box that shows all of the ways you can reply to a contact — including email, chat, SMS, and Facebook.

• Voice input: Write your mails with voice. Cool na?

• The app supports Multiple Gmail accounts and lets you sync multiple accounts to the same device and switch between them without leaving the app.

• A handy 'undo' link makes it easier to retrieve messages when you hit archive or delete by mistake.

You can also watch a video here: