Sometimes (didn't find out when) I changed some files like for example theme.css, but on seam deploy it doesn't get into the folder exploded-archives and so not into my project-ear.

Because it annoyed me more then once, I tried to write an ant task to get rid of the old file versions.

I added a clear-task to the project-build-xml-file and call it in the seam-gen-build-xml-file.

seam/seam-gen/build.xml:

<target name="clean" depends="validate-project" description="Cleans up the dist and exploded folders">
  <echo message="Cleaning up temporay data in project '${project.name}'" />
  <ant antfile="${project.home}/build.xml" target="clean" inheritall="false"/>
</target>

project/build.xml:

<target name="clean" description="Clean up the temp exploded archives and dists">
  <delete dir="exploded-archives/${project.name}.ear" failonerror="no"/>
  <delete dir="exploded-archives/${project.name}.jar" failonerror="no"/>
  <delete dir="exploded-archives/${project.name}.war" failonerror="no"/>
  <delete file="${dist.dir}/${project.name}.ear" failonerror="no"/>
  <delete file="${dist.dir}/${project.name}.jar" failonerror="no"/>
  <delete file="${dist.dir}/${project.name}.war" failonerror="no"/>
</target>

HTHso ;)