JIRA seems to suggest that the latest version of Negotiation is 2.0.3.SP1 (around April 2009), but the Downloads link only shows 2.0.3.GA (around Janurary 2009).
https://jira.jboss.org/jira/browse/SECURITY?report=com.atlassian.jira.plugin.system.project:roadmap-panel
http://jboss.org/jbosssecurity/downloads/JBoss%20Negotiation?action=a&windowstate=maximized
It would be great to see the latest version available.