YOURLS - Your Own URL Shortener

URL shortening services are ubiquitous on Twitter and other cramped online spaces. They won’t all last, as tr.im has demonstrated, and their shutdowns could annihilate your linking history. If you own a domain, though, you can host your own service.
Even if you consider the links you’ve shortened for Facebook, Twitter, IMs and other services to be just of-the-moment, nothing-serious items that aren’t worth backing up, leaving a host of dead links lingering around the net isn’t good for anybody, or anyody’s searches. There’s not a lot you can do about your already-posted social network links, but anyone who’s got $US10 for a domain name registration, and a creative short URL idea, can host, monitor and control their shortened links.
For basic installation of Yourls see Lifehacker Australia
Yourls—it’s one of those apps that, once you get it working, just works. There are, however, two added tools worth noting: a WordPress plugin that can automate the creation of Yourl-generated short links for each and every post, and a bookmarklet generator for those who don’t want to head back to their own site to create new short links.

This was seized 4 u at Lifehacker Australia