We need to investigate adding full enterprise support using MSI over SMS/Active Directory. There are several CRs related to this:

7023719: repeated use of 'msiexec /I' leaves installed JRE product in an inconsistent state"

At one point we supported/documented this at:

http://download.oracle.com/javase/6/docs/technotes/guides/deployment/deployment-guide/install-msi.html

Our installer has become more complex and we've gotten more demands/requirements from customers.