To make them more friendly you could use one of the many, many short URL services, but most come with strings. Or you can setup something similar right on your own website, using a PHP forward. Here is how:
1.) Create an easy to remember file name or folder, such as http://www/yoursite.com/mylink.php or http://www.yoursite.com/link. If you are creating a folder, the file inside the folder that holds the code would should be named index.php
2.) Put this code into your file:
Make sure you replace our long URL with the one you want to direct to.
<?php header( 'Location: http://www.yoursite.com/this/is/a/long/url/you/want/to/direct/to.php' ) ; ?>
3.) Upload the file, and share your new short URL with friends!