Meet Google's URL Shortner: http://goo.gl/ it's pretty cool because it lets you condense any long URL. This is especially useful for things such as linking friends for for meeting the 140 character limit in a tweet.
Of course Google didn't stop there. They decided to have a little fun with it.
For instance, here is iSmashPhone shortened: goo.gl/WGCn that link will take you to iSmashPhone's home page.
Now if you type that same URL out and add .qr goo.gl/WGCn.qr and navigate there, you will get a QR code:
Just for fun, we downloaded a free App for the iPhone called QR Reader for iPhone: Link
There are plenty of them around, we just grabbed the first free one we saw.
Then we simply take a picture and the iPhone navigates to the website. Check out the video above.
As a side note it's possible to shorten a URL on your iPhone, or add the .qr to generate a QR code from your phone:
Accessories & Apps: Beta Testers Wanted
iOS Firmware/IPSW Download Guide
Legacy iTunes Download Archive
App Store Top Charts
iPhone and Android Resale Value Charts
USA iPhone Carrier Plans Compared
Complete iPhone Jailbreaking Guide 
Complete iPhone Specification Matrix 
Just came to your site through google while searching for url shortening service. I was not aware of google url shortening service. Thanks for the great info.