There is a great Eclipse plugin witch helps you to use various bugtrackers. This plugin’s name is Mylyn! There is a connector for Redmine too, witch name is redmin-mylyncon. Let’s see how to set it up!

Server side:
ruby script/plugin install https://redmin-mylyncon.svn.sourceforge.net/svnroot/redmin-mylyncon/redmine_mylyn_connector/tags/CURRENT
mv vendor/plugins/CURRENT vendor/plugins/mylyncon
rake db:migrate_plugins RAILS_ENV=production
/etc/init.d/apache2 restart

Client side:
Download the plugin from this Eclipse repository:
http://redmin-mylyncon.sourceforge.net/update-site/nightly/