I've just read Clarke Ching's Rock's into Gold on SlideShare. It's a delightful short story which explains how incremental delivery can improve cash flow, saving jobs in the process.
I first met Clarke at XP Day a couple of years ago. Several friends told me how much they liked his Introduction to Agile Development, so I went along. I'm glad I did.
Clarke's presentation was excellent - clear, simple, business focussed, and very compelling. So's Rocks Into Gold. I've started to use it as a resource for prospective agile adopters; I may even save a few jobs!
Read it and spread the word.