How to manage passwords of lots of server?

[MontyRee <chulmin2 () hotmail com>]

Hello list..
 
Please share your valuable experience.
 
I  have operated thousands of linux and w2k servers in the datacenter.
So if I will change the admin(root) password, actually it is impossible..
(because there are so many servers..)

Mainly I use ssh at linux and terminal server at windows server to remote login. 

So is there any good method or solution to solve this problem?
How about radius? is it best solution at my case?
then, anyone who have used radius(free or commercial) well at this environment?
  
Thanks for your sharing information.
 
 
Regards.
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