Delegating Domain Administration - Win2k3

["WALI" <hkhasgiwale () gmail com>]

Hi All,

Having recently commissioned a Windows 2003 R2 based and Exchange 2k3 
included single domain AD model across various branches of my company spread 
across 4 different countries, I want to write a policy/procedural document 
detailing delegation of service/administration accounts across all units. 
The branch units are represented by OUs within the single child domain - say 
abc.zyz.local ( parent root domain 'xyz.local' being empty).

What's the best way to go about it? How should the OU administration be 
spread across? What would be the exchange administration best practices? 
Who/how should the schema admin/domain admin rights be spread across? Who 
should have the FSMO roles and what should be the criteria?
We have a global 2Mbps MPLS network connecting all the DC's/exchange servers 
within this model, so bandwidth isn't an issue probably.

Any/all advise is welcome.