Pushbullet is a lightweight application which sends all manner of push notifications to your other devices or those of friends. Paired with a Chrome extension, Pushbullet can mirror all of your Android device's notifications on your computer, and even lets you reply directly to text messages without having to use your phone. Snippets of text, website links, images, addresses, files, and lists are the kinds of content currently supported by Pushbullet. Pushes can be sent directly through the system-wide share menu to one or all of the destinations hooked up to your account, while recieved pushes can also be in turn shared out through other channels available on your device. A full history of pushes, both sent and recieved, are accessible through your device and the web.
If you're constantly sharing content with a few select people, or just need an easy way to get stuff bounced back and forth between your computer and your phone, Pushbullet is the ideal way to do it.