Unzip it in :
- Eclipse_Home/dropins for Eclipse 3.4, 3.5 and 3.6
- Eclipse_Home/plugins for Eclipse 2.1, 3.0, 3.1, 3.2 and 3.3
Plugin activation for Eclipse 3.x :
- launch eclipse once using this option : -clean
- if Tomcat icons are not shown in toolbar : select menu 'Window>Customize Perspective...>Commands', and check 'Tomcat' in 'Available command groups'