WHAT! An API?

Yes. We have an API, get over it. We have two ways you can shorten an url using this API:

The HTTP-Request-URI Method
Request Syntax: http://api.x0.no/?[Long URL] (e.g: http://api.x0.no/?http://x0.no)
Request this URL with a "?" and your address, and you will recieve your shortened URL as a response
This should work for most people, unless you have really weird URLs.

The HTTP-POST Method
Just post the POST-variable "u", containing your Long URL to http://api.x0.no/post
And it will reply with your shortened url!