Bitly is a “freemium” URL shortener. It lets you easily shorten links from around the web. You also track the traffic stats from your shortened Bitly links, similar to Google Analytics. You can even use your own branded short domain, instead of the default or domains.
Bitly has an iPhone app that lets you create Bitly links and check your stats on the go.

On the desktop side, Bitly offers free bookmarklet’s for Safari and Firefox, as well as a native Google Chrome Extension for quick shortening while your surfing the web. They also have a WordPress plugin that automatically creates “Bitlinks” for new blog posts, for quick sharing to your social media accounts.