Just wrote a simple URL shortener in PHP. It generates shortened URL's in the format "http://xbsd.nl/aBcD", in which the aBcD part is a random four character string. You can give it a go over at http://www.xbsd.nl/url/. No spam or malicious URL's or whatsoever - just plain and simple short URL's - promised ;-). Feel free to drop me any {suggestions,feature requests,bugs,other}.