Free WordPress Plugin to track clicks on external links
Find out where your visitors leave to! This Plugin allows you to track which external links your visitors click on. Multiplce clicks from the same IP-address can be omitted.
To achieve this the link-log Plugin changes all your links to external sites. The link change takes place when a post or page is displayed. When editing a post or page in back end all links appear unchanged. There is no need to change anything.