SVN Deployment managed by Redmine
In some other hosted system there is functionality to deploy a SVN repository via ftp or ssh to a remote server. (http://www.springloops.com has this which links to basecamp). This allows you to setup several deployment paths for your code (development server, staging server and live server for example) and then allows you to deploy a particular revision to one of these servers.
A stage further would be to then update the issues which should be impacted by the revision so issues can then be verified as being fixed.