3.ly - Threely - The Shortest URL Shortener in the World!
http://3.ly/
Very impressive!
3 letter URL shortener
for twitter and likeBuilding a URL Shortener
Snook.ca - Web Design, Development and Consulting Services
Read the comments!!!!
Jonathan Snook on how to roll your own URL shortenerTrick.ly
url shortener
Awesome new URL shortener, http://www.trick.ly/ allows you to set a password question to gain access to the long URL, perfect for fact tests
How to make URLs short and password protected