Impact of removing administrative rights in an enterprise running XP

Hello all,
I wonder if anyone on the list who might work for a good sized enterprise 
(10,000+ seats) has gone through the excercise of removing administrative 
rights from the user community?

Aside from the effort to inventory all applications and ensure that they work 
with restricted permissions, I forsee that such an effort would likely require 
changes to the entire support model.  Instead of relying on users to install 
their own software, it would need to be done for them.  New hardware would 
require intevention, etc.

If someone has completed this, was support a major new burden, or was it not as 
difficult as it might be?  If it was, how much of a burden was it (+ desktop 
support headcount? +helpdesk calls?)?

-Ds

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