Central User management question

Are there any tools/recommendations that would allow for central management of database users? What I am looking for specifically, is a single location where we can grant a user access/privileges to a subset of the environment. For example, if a new Developer joins the organization, we could centrally manage what databases they should have access to and allow for a common password on each of the targets. This should also allow us the ability to remove someone's access from one location without having to visit X number of databases.

I found the 11g Enterprise user security feature which seems to be what we are looking for, but I haven't looked into it enough yet to know about version compatibility or licensing associated with it.

Thanks in advance

Mike  

--
http://www.freelists.org/webpage/oracle-l