Respond to E-mails Inline (Android 2.2 and higher)
The latest version of the Gmail app allows you to respond to e-mails right in the message you received. Reply to a message, tap the Respond Inline button below the Compose field, and then add your comments within the text of the sender’s original message.
Mute E-mail Messages
Tired of reading co-workers or friends’ lengthy back-and-forth e-mails that don’t involve you? Mute ongoing conversations that you’re no longer part of and have all new messages in the series appear as read in your inbox. In a Gmail conversation, hit the Menu key > More > Mute.
Set Up Your Priority Inbox (Android 2.2 and higher)
You can now download an updated Gmail app that supports Priority Inbox, a feature that moves e-mails from frequently contacted recipients to the top of your inbox. Download the Gmail app update (Version 2.3.2) from the Android Market. To activate this feature: In the Gmail app, hit the Menu Key > More > Settings > Priority Inbox (Note: Unlike Gmail on the web, you can’t toggle between the regular inbox and priority inbox without digging into settings).
Add the Important Label, or Any Other Label, to the Home Screen
Priority Inbox works by assigning a special “Important” label to e-mails from the people you write to the most. In Android, you can add that label, or any other label in your account, to your home screen. When you select that label on your device’s home screen, the Gmail app will launch with only the appropriately labeled messages displayed in your inbox. Long press a home screen > Shortcuts > Labels. Then select the label you want to add.=
Install Astro File Manger
Astro File Manager is useful for opening photos, videos, and other documents moved to Android devices. Download it from the Android Market for free.
Transfer Files from PC to Phone
To move music, pictures, video, or any other media files from your Android phone to your PC and back again, you’ll first need to make your SD card accessible by mounting it. Pull down the Notifications tray > select the USB icon > choose the option to mount as a disk drive.
Back Up Games to an SD Card
Android doesn’t allow all apps to run on the SD card (though doing so would free up RAM resources), but you can store games on removable storage. Settings > Applications > Manage Applications > All > select a game > Move to SD Card.
Back Up App Content to on SD Card
Not all Android apps store data in the cloud. Examples include Note Everything, the medical app OnTrack for Diabetes, and most voice recorder apps. If you want to protect against losing your data or files, or if you are switching to another Android phone soon, back up app content to an SD card. Check the settings option in each app to find out how to back up content.