I have been using the URL shortener service bit.ly for a couple of months now and love it. bit.ly allows users to shorten, share, and track links (URLs). Reducing the URL length makes sharing easier when you are using Twitter or even sending links via email.
Aside from the convenience and usability issues it resolves, my favorite thing is being able to track the shortened links i publish. Great for seeing how many clicks i get from a Tweet post with a shortened URL but also for tracking who has clicked on the link i sent them. Recently i sent a shorten URL to a coworker, a couple days later in conversation i asked what they thought of the link i sent them, they answered that it was great. yes. i believe it that is, that is why i sent it to you. but not that you actually read it. nope according to my bit.ly tracker you never clicked on it. oops.