http://plugins.vuze.com/update/pluginlist3.php?plugin=pluginID

Examples:
http://plugins.vuze.com/update/pluginlist3.php?plugin=twitter
http://plugins.vuze.com/update/pluginlist3.php?plugin=snarl
http://plugins.vuze.com/update/pluginlist3.php?plugin=azmsgsync
http://plugins.vuze.com/update/pluginlist3.php?plugin=snarl,azmsgsync