How to install flex-mojo

Add repository to ~/.m2/settings.xml:

<settings>
 <profiles>
    <profile>
       <id>flex-mojos</id>
           <repositories>
               <repository>
                   <id>flex-mojos-repository</id>
                   <url>http://svn.sonatype.org/flexmojos/repository/</url>
                   <snapshots> <enabled>true</enabled> </snapshots>
                   <releases> <enabled>true</enabled> </releases>
               </repository>
           </repositories>
           <pluginRepositories>
               <pluginRepository>
                   <id>local</id>
                   <url>http://svn.sonatype.org/flexmojos/repository/</url>
                   <snapshots> <enabled>true</enabled> </snapshots>
                   <releases> <enabled>true</enabled> </releases>
               </pluginRepository>
           </pluginRepositories>
       </profile>
   </profiles>
   <activeProfiles>
       <activeProfile>flex-mojos</activeProfile>
   </activeProfiles>
</settings>

Invoke the following command:

mvn info.flex-mojos:install-mojo:install-sdk -Dflex.sdk.folder="C:\Program Files\Adobe\Flex Builder 3 Plug-in\sdks\3.1.0" -Dversion=3.1.0

You can find additional information on google code site http://code.google.com/p/flex-mojos/ and blog http://blog.flex-mojos.info/