New posts in Url Shortener

Java: How to easily check if a URL was already shortened?

How Does The Google URL Shortener Generate A 5 Digit Hash Without Collisions

URL shortener with no database

How can I unshorten a URL?

How to generate unguessable "tiny url" based on an id?

jQuery on the fly URL shortener

How do short URLs services work?

YouTube-like GUID