Many people have shown interest in using Reynaldo Alvarez's ShortURL hack. As Reynaldo has posted in the forums, the hack DOES work. But there are a few of glitches using it with Xoops. The problem is related to how the hack deals with relative links and how the developers had coded their Xoops modules.
To make the hack fully operationable, you must be willing to make some changes to various module files. This little guide is intended to serve as "pointers", so you can make the required change easily.
The whole guide can be found at http://xoops-tips.com/modules/news/article.php?storyid=62
You can also download the PDF version of the guide from Xoops Tips site.