HOW TO MOUNT THE PROJECTS IN ECLIPSE
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Note: This solution (using nested project trees) requires Eclipse 3.2+ and the Subversive 1.1.0+ plugin
      This does *NOT* work with the subclipse plugin (1.2.0 as of now) as it doesn't support nested projects
      and will hang Eclipse if you try it anyway...
      See http://subclipse.tigris.org/issues/show_bug.cgi?id=511

From the checkout directory, run

  $ mvn install
  $ mvn -P apache-SNAPSHOT-plugins eclipse:clean
  $ mvn eclipse:eclipse

This will generate Eclipse .project and .classpath files for all (non-pom) sub projects.
Note: the 2.4-SNAPSHOT version of the maven-eclipse-plugin is currently used to append
the current version to the Eclipse sub project name.

Then, delete the .project file in the checkout directory (Eclipse will itself recreate it after the import of the sub projects).
Do File-Import->Existing projects into workspace and point to your checkout directory
and it should detect and preselect all sub projects.
After importing refresh the main checkout project and Eclipse will recreate the deleted .project file.

Note that you need to declare the M2_REPO classpath variable in your
workspace, it should point to your local m2 repository.

For further information about the maven eclipse plugin visit 

  http://maven.apache.org/plugins/maven-eclipse-plugin/