What I did to deploy jboss snowdrop is I dropped the snowdrop-deployers-1.1.0.GA.jar, snowdrop-vfs-1.1.0.GA.jar, and snowdrop-weaving-1.1.0.GA.jar at jbossAs_home/server/default/lib. I use jdk1.6.
The snowdrop-deployers-1.1.0.GA.jar needs to go into deployers/ directory.
As we need to pick up the deployer beans defined in its META-INF/*-jboss-beans.xml,
which doesn't happen if you simply put it into lib dir.