I am not sure it'll work. I can try though. The libraries are: server/default/lib/jboss-persistence.jar and server/default/deploy/jbossdo.sar (contains nothing but META-INF/jboss-service.xml).
Just to let you know... to even get the JBossDO.sar to deploy without errors, I also needed javassist.jar and jboss-common.jar (in addition to the two files you mention) from 4.0 DR2. See the attached file to view the output from run.bat, and then the deploy.
I am trying to get this to work on jboss-3.2.1_tomcat-4.1.24. I got the needed jars from the 4.0 DR2 on the download page, not from the CVS head or snapshot. The example app I am trying to deploy is the example app from the JBossDO page. I was able to deploy the example app on 4.0 DR2 just fine. Haven't played around too much, but I was wondering if anyone else had tried.