This plugin integrates the Polarion WebClient for SVN, an open source, web based interface to Subversion.
Configuration simply involves choosing 'Polarion Web Client' as the repository browser when configuring a project to use Subversion as its source code management.
Once configured, the change logs of a build will provide links to the specific Subversion revision as well as the color coded difference views within Polarion WebClient.
Note that JIRA also integrates the Polarion WebClient as a web based viewer of subversion changes related to issues. When coupled with the Hudson JIRA plugin this combination provides a very useful integration between source control viewing, issue tracking and continuous integration and builds.