I couldn't agree more with Uday's comment on Union Square Ventures' post on Hiring a VP of Engineering or CTO for Non-Techie Founders.
"The VP-Eng & CTO are 2 different job types.
VP-Eng Responsibility: To deliver products.
He Speaks: Budget,resource,process,schedule and product delivery.
CTO Responsibility: Technical roadmap for the company.
He Speaks: Evangelism, Stds, Architecture, Technology, Vision,Customer..."
- Uday Subbarayan