Just a quick tip on finding which servers hold the Flexible Single Master Operations(FSMO) roles.
Enter the following at the command prompt from any Domain Controller:
for %x in (schema name infr pdc rid) do dsquery server -forest -hasfsmo %x
An explanation of the roles and how to transfer them can be found here: http://support.microsoft.com/kb/324801
Edit: An even quicker way is to type:
netdom query fsmo
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try running:
netdom query fsmo
nice and simples
Thanks Shaun, much easier!