- Can we mix RedHat Enterprise v4 application instances and Windows 2003 (x86) application instances within the same Application cluster?
Yes. Assuming "cluster" refers to a group of applications servers connecting to the same database.
- Are there any concerns to running a configuration like this? (Load balancing of the Linux and Windows into separate pools, copying files, etc…)
Not that I've seen
- Is there any documentation for configuring/running multiple application instances on one OS instance?
In the BladeLogicAdministration.pdf for 7.4.x
- Is there any documentation for the new Kerberos/LDAP functionality for user authentication?
should be same as above - though by 'new' what do you mean?