Most of us know that url shorteners are valuable. Some of the leading services are bit.ly, Google and BudURL. While the temptation is to use a free service, consider an inexpensive premium service. Linking your url's to your web analytics service can really enhance your knowledge of what is truly generating your traffic.
For instance, for this post I could use this url, or the direct link given at the bottom of the post. The premium service from Bud also allows me to use my own sub-domain, and even QR Qodes (think smartphones).
Here is one day's worth of reports for the url which I have linked in the previous paragraph. Please note than much of the information is "clickable" and allows me to drill down for greater understanding of my results!
And a service can be easily invoked!