IGPs and services?

I'm looking for some advice on IGP tricks such that we can give out the same IPs for a specific service (say...DNS) to all of our customers despite geography and have my IGP route those packets to a regional server, thus accomplishing some inherent level of load balancing, and even eventually returning data based on client geography. I understand that nanog may not be the appropriate forum for this discussion, but I thought perhaps that someone could point me to a better place to discuss this? Or perhaps those of you with experience in the area could email me off-list? -- nicholas harteau nrh@ikami.com