There are many URL shortening services and Tiny URL is one of the most popular one. Here is a new shortening service, Tr.im, which does more than just shorten, it tweets the URL shortened. This service helps you to send your tweet to Twitter and Identi.ca. Apart from this, the service also tracks stats and allows commenting on your URLs. With Tr.im, you can create an account or use exisiting Twitter account to see the history of all URL shortening.
Tr.im also provide stats on the URLs converted. It provides stats on how many people visited the link and the date of creation of the link.
Another feature of Tr.im is that it retweets all the popular URLs which were trimmed. It provides good options to customize in the preferences.
Tr.im is a good service with lots of options considering the other URL shortening websites.