The other day I stumbled across http://appsto.re, a DNS client domain which is a pretty useful specialized URL shortener for iPhone apps.
A good example is easyDNS’ own iPhone app for easyWhois. The iTunes URL is loooooooooooooong and cumbersome, and to be honest, I can’t readily remember what shortened URL I created for it on easyURL (I think maybe http://easyurl.net/easyiphone?)
You can even create your own custom shortened URLs for any given iPhone app.
The other interesting thing about appsto.re that distinguishes it from most of the other URL shorteners out there, is that it actually has a revenue model, since I imagine they can use affiliate links to redirect to the paid apps (sorry guys, our app is free).