Hello,
i installed JBossTools 2.0.0.200707100301-nightly, and now every time i wanna install another new feature the eclipse-update manager claims
JBossTools (2.0.0.200707100301-nightly) requires feature "org.eclipse.jem".
Please watch this issue:
http://jira.jboss.com/jira/browse/JBIDE-500?page=comments#action_12368700