First, Gmail's popular and useful Priority Inbox is now included in the app. Priority Inbox view on your Android device includes all of the messages deemed important, regardless of whether or not they have been read; you can archive messages, delete, or mark them unimportant. You can also set up notifications for your Priority Inbox; configure your phone to vibrate or ring in the settings menu.
Find out what else is new after the break.
Second, the compose mail screen has some new improvements, including an easy way to switch between replying to the sender, replying all, and forwarding a message. Additionally, if you've moved to Gmail from a different webmail account, you can now send emails from that address, too.
The new version of Gmail for Android works on Android 2.2 and the new Android 2.3 and is available free from the Android Market.