App Notifications is an iPhone app that provide real-time notifications for Twitter, GMail, Google Voice, RSS feeds, and many other services. Just register an account with appnotifications.com, download the app from the App Store ($1.99), and start being updated instantly!
App Notifications provides an API for the developers to apply instant notifications to custom services!
Pros & Cons
|Support many services: Twitter, GMail, RSS feeds, and others|
|Provides an API for developers|
|Great idea for wide support of push notifications to iPhones|