Multiple authorized keys

[Joey Prestia]

Anyone know of a way to have multiple ssh authorized_keys files for host 
key authentication for different users. I am familiar with the usual 
practice of echoing all of the users keys into authorized_keys file but 
I am thinking in terms of if I have to revoke keys and disable user 
access. What I would like to do is have a setup similar to apache in 
that it can have files included in the conf directory. So this way I 
have a user name or identifying indicator of whose key is whose so I can 
revoke access as the necessity arises.

-- 
Joey