2 Site Exchange 2010 CAS Array - Active/Active with GTM

Michael, we are looking to use the single namespace - active/active data center, and APM to query AD and intelligently route users to the appropriate CAS pools. You had mentioned you had a solution for this. I would love to see what kind of APM/irules/etc used to make this work. Would you be able to share them with me or point me to the documentation used to create this design? Thanks in advance.