Free URL Shortener Script

[nYXem]

I need some suggestions regarding this.
I found few by googling. But often some great stuff remain unexplored.
If you know a nice one, please share here.

Few features I like:
AJAX
User Registration
API support and all those geeky stuff :P

But these are not must, so just share what you know.

Help me out with this 8-)

 

[anhthoai]

I recommend yourls.org or you can buy one premium url shortener script like
PHP Scripts - Premium URL Shortener | CodeCanyon

 

[krlos]

I know Linkmize Script is not free but easy to find and it works great