We use Google Apps Accounts and Services for our members and in our business enterprises, using these services you can enable your own shortlink service using your own domain name. This is much like the service commonly utilised on Twitter called 

Ours is simply called URL, if you have an AssistNZ email address you can log in to this service, otherwise you can view the links but not set up your own at this point. The service can be found at  http://url.assistnz.com