As a strong believer in Agile methodologies, I had a lot of discussions to convince the non-believers. When you talk to a CIO, CEO, CFO, you need of course a different approach and different arguments than when you are talking to a developer or project manager.
I found this article on InfoQ full of tips, ideas and arguments to convince the CFO(Chief Financial Officer, read as: the guy with the deep pockets).
A must read if you want to discuss Agile in financial terms.