Free Short URL Script: Shorty
Shorty is a PHP script for creating shorter, human readable links from long URLs.
A reason to prefer using Shorty for personal use rather than TinyURL or similar services may be eliminating the risk of these services becoming offline and losing your links, as you can use this free short URL script forever.
Shorty has an admin interface where links can be organized and clicking statistics can be viewed. You can even have a RSS for your links.