Get pinged every time your fave Twitterer tweets, or open Gmail mobile rather than the iPhone's native app to read email. Boxcar acts as your communication portal, letting you customize notifications, functions, and more for 15 apps and services, from omnipresent Facebook to more obscure pastimes like Reddit subforums.
WIRED Pipe in your desktop's Growl notifications. View all your notifications in one inbox.
TIRED Push notifications can be slow to arrive. Costs $4.99 to disable ads.