http://solve.rackspace.com/
This is a free event hosted by Rackspace that can help high volume / high compute power entities with their cloud deployments.
I built my own mini cloud cobbling together VPSs from www.lowendbox.com. I'm fairly recently graduating to building out complete assembly lines using cloud deployments, and I'm most interested in building up my RTB capability so I can work with DSPs directly.
P.S. I'll be in attendance.