After seeing a response to a thread on Hacker News, I thought I'd have a crack at making a simple little URL shortener with CodeIgniter. I've never used the framework before and it was a nice quick little app to implement and get a feel for things. It's not quite worthy of competing with Bit.ly or Tinyurl.com, there's no checking for spam urls etc, but if you want to take a look, the source code is available, as is a live demo at lnkd.in.