The maven team is pleased to announce the Maven Plugin Plugin 1.6-SNAPSHOT 
release! 

http://maven.apache.org/reference/plugins/plugin/

Maven Plugin management plugin. 

Changes in this version include:

  New Features:

o Added new assert:assertFileContains tag that verifies if a file contains a 
  specific string. 
o Add plugin:generate-tags goal 
o Mention in docs for the plugin:repository-deploy that it uses the artifact 
  plugin  

To automatically install the plugin, type the following on a single line:

maven plugin:download 
  -DgroupId=maven 
  -DartifactId=maven-plugin-plugin
  -Dversion=1.6-SNAPSHOT

For a manual installation, you can download the plugin here:
http://www.apache.org/dyn/closer.cgi/java-repository/maven/plugins/maven-plugin-plugin-1.6-SNAPSHOT.jar
         

Have fun!
-The maven team