Problem: How to Install additional plug-ins for JMeter, for example if you want to view Response Times vs Threads or Transaction throughputs vs Threads
If you do not have Jmeter installed, download Jmeter at http://jmeter.apache.org/download_jmeter.cgi
Download latest JMeter plugins at http://code.google.com/p/jmeter-plugins/
To install the JMeter Plugins, you simply have to copy the JMeterPlugins.jar file from JMeterPlugins-VERSION.zip inside JMETER_INSTALL_DIR/lib/ext, for example to c:\jmeter\lib\ext in case of windows installation. Now you can restart your JMeter and see jp@gc-prefixed plugins in menus.
If you plan to use the Servers Monitoring Listener, you must also install the server agent on all servers as described here.
Installation instructions can also be found at http://code.google.com/p/jmeter-plugins/wiki/PluginInstall