Google URL Shortener

Google URL Shortener at goo.gl is a service that takes long URLs and squeezes them into fewer characters to make a link that is easier to share, tweet, or email to friends. The core goals of this service are: stability, security and speed."

• Stability – ensuring that the service has very good uptime
• Security – protecting users from malware and phishing pages
• Speed – fast resolution of short URLs

The service is only used by Google Toolbar and FeedBurner, so there's no web interface or API for goo.gl for now.