One topic that’s unusually difficult to wrestle to the ground is what to do about what is often referred to as "engineered systems" -- vertically-integrated single-purpose software and hardware stacks, designed to be consumed as a dedicated appliance. I would put Oracle’s Exa line in this category, as well as data warehouse appliances such as Teradata and Netezza.
Just to be clear, I consider these purpose-built beasts as quite distinct from the horizontal converged infrastructure offers (Vblocks, etc.) that can be used for many different purposes as well as support open management integration.
And, as I tell anyone who will listen, this is going to be one of the harder choices you’ll have to make.