URL shortening service Bit.ly previously charged for their premium service Bitly Pro. The advantage of Bitly Pro was the ability to create custom short domains. Some of their clients include gat.es (The Gates Foundation), diddy.it (Diddy), and cart.mn (South Park). Bitly Pro is now out of beta and is available for free and with no waiting charge. Register the short domain that you prefer to use and point it to Bitly’s servers. Then hook up your Bitly account at http://bitly.com/a/account. [Bitly Blog]