Tomcat installation changed, problems launching Tomcat in Eclipse

• Install location of Tomcat has changed.  Get message "The archive: [...]/apache-tomcat-6.0.20/bin/bootstrap.jar which is referenced by the classpath, does not exist." when attempting to launch Tomcat in Eclipse
• Fix: 
1. In Servers view, double-click on Tomcat server.  Overview of Tomcat settings appears.  
2. Click on "Open launch configuration"
3. Go to Classpath tab
4. Edit User Entries as appropriate
• If you haven't already, specify your Tomcat installation under Preferences > Server > Runtime Environments