Zi.ma offers bulk URL shortening, customizable URLs and tracking. Also, registration is not required to view statistics of Zi.ma links.
Cligs also offers tracking, which are real time and very detailed, however unlike Zi.ma you have to register to utilize those tools. They also offer geotarget URLs based on the country of visitor.
Tiny URL is utilized by Twitter and the links you create never expire. You can customize your URL, however they don't offer tracking. They also offer a toolbar button that can be integrated into your browser. It was created by Kevin Gilbertson who launched the service in January 2002 because he wanted to be able to link directly to newsgroup postings which frequently had long and cumbersome addresses.
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