Using Tr.im and Twitter
I've recently discovered tr.im a great URL shortening service. What makes this service of particular interest is the ability to create an account and monitor how many people use of follow your tr.im'ed URL.
Creating an account is optional and you can still use the service without one but the ability to track if and how many people actually follow the link is a great addition.
If signing up for yet another account puts you off, don't worry, you can use your twitter username to log in and create an account. This gives you the additional ability to tweet your tr.im'ed URL straight to twitter.
They also provide a nice little bookmark which trims the URL of your current page and offers you the opportunity to tweet it directly - a great time saver.
Check out http://tr.im/