Mail Notifier

Support for Hotmail, Gmail, and AOL
Support for any IMAP email account
Add unlimited number of accounts
Preview the email in the push notification
Badge indicator of your unread emails in REALTIME
Notifications are instant (no polling or fetching)
Ability to set a silence period
Selectable ringtones for each account
Option to launch web mail from notification
Option to hide email preview in notification for privacy
Better on battery life for your iPhone